112 results about "Plastic pollution" patented technology

The invention relates to a microplastic pollution traceability method, system and device and a storage medium, and is applied to the field of water pollution traceability. Cleaning, standardizing and spatially aligning micro-plastic data and then storing; constructing a micro-plastic pollution source space-time diagram, and performing definition reinforcement on the micro-plastic pollution source space-time diagram to obtain a reinforced micro-plastic pollution source space-time diagram; performing space-time dependence modeling on the enhanced micro-plastic pollution source space-time diagram to obtain a dynamic pollution propagation probability diagram, extracting feature vectors of social economic plastic data and micro-plastic multi-modal feature data in the micro-plastic data, and performing fusion to obtain fused multi-modal features; performing model training by fusing the multi-modal features and the dynamic pollution propagation probability graph to obtain a traceability model; and setting a dynamic threshold value and a dynamic risk level, and performing microplastic pollution tracing and pollution alarm according to the dynamic threshold value, the dynamic risk level and the tracing model. The technical effect of the invention is that the microplastic pollution traceability precision is improved.

The invention provides a preparation method and application of a dynamic covalent bond compatibilized thermoplastic blend, and relates to the technical field of high polymer materials, the method comprises the following steps: (1) carrying out melt blending on at least two incompatible or partially compatible thermoplastic polymer blends, a reaction reagent containing acid anhydride or carboxyl groups, an initiator and an auxiliary agent according to a mass ratio of 100: (0.5-12): (0.05-1.5): (0.5-12), carrying out reactive extrusion to obtain a grafted modified material; and (2) carrying out melt blending on the grafted modified material, a cross-linking agent containing an epoxy group or a hydroxyl group and a catalyst according to a mass ratio of 100: (1-20): (0.1-5), and carrying out reactive extrusion to form a dynamic covalent bond network so as to obtain the compatibilization blend. According to the invention, the compatibility and mechanical properties of the thermoplastic blend are improved, and the problems of high recovery cost, complex recovery technology, serious plastic pollution and the like of the waste thermoplastic plastic blend in real life are solved.

The invention discloses an underground water micro-plastic pollution prediction method based on machine learning, and relates to the field of ecological environment, and the method comprises the steps: carrying out the unified grid and standardization processing of global micro-plastic observation data and multi-source environmental factor data; constructing and training a regression model and a classification model to predict a logarithm value of the microplastic concentration and a probability that the logarithm value exceeds a preset threshold value; carrying out feature importance analysis on the regression model and the classification model, and determining master control environment factors influencing micro-plastic pollution; according to the output probability of the classification model, a risk threshold is determined in combination with a diagnostic criterion, and a high-risk area is divided; applying a space mask to the high-risk area; carrying out coupling calculation on the micro-plastic pollution risk probability, population distribution data and underground water dependency data, and evaluating the number of potential exposed population grid by grid; and carrying out uncertainty quantification on the evaluation result of the number of potential exposed population. According to the method, the spatial distribution prediction of underground water micro-plastic pollution is realized.

The invention belongs to the technical field of nanocellulose materials, and discloses a dissolved nanocellulose high-strength film and a preparation method thereof. The method comprises the following steps: 1) dissolving a cellulose raw material with a solvent to obtain a cellulose solution; 2) mixing the cellulose solution with a mixed solvent of water and ethanol, and performing nanoscale dispersion to obtain a dissolved nano cellulose dispersion; and 3) washing the dissolved nanocellulose dispersion, and forming a film to obtain the nanocellulose high-strength film. The method is simple, green and environmentally friendly, the prepared nano-cellulose high-strength film is high in light transmittance, the strength can reach 140-200 MPa, additional auxiliaries are not needed, the problem that an existing nano-cellulose film is poor in mechanical strength is solved, the contradiction between traditional plastic pollution and material strength and degradability is effectively solved, and conversion from the material industry to greenization and high performance is promoted.

The invention relates to the field of functional materials, in particular to chemical recycling of a series of polyesters represented by PET (Polyethylene Terephthalate) by using a novel and efficient magnesium-based catalyst technology, which is of great significance for treating plastic pollution and realizing green circular economy.

The invention relates to the technical field of wastewater treatment, and particularly discloses a degradation method and application of microplastics in aquaculture wastewater. The degradation method comprises the steps of preparation of the mesoporous structure magnetic immobilized material, pretreatment, adsorption-enzymolysis, microbial degradation, magnetic separation, precipitation and the like. The compound enzyme is efficiently fixed through the shell layer of the mesoporous material and the mesoporous structure, enzyme loss is avoided, and the total microplastic removal rate reaches 94.5% or above in cooperation with targeted degradation of the compound enzyme on PET, PE and PP; the composite thermoduric bacteria relay enzymatic hydrolysate is deeply mineralized, and a staged treatment agent is matched to enhance mass transfer, so that the microbial activity is improved by 3 times; the mesoporous material is protected by a shell layer, the enzyme activity retention rate exceeds 85%, the COD of effluent is smaller than or equal to 50 mg / L, the effluent meets the emission requirement, and the method is suitable for multi-scene micro-plastic pollution treatment and has high efficiency, economical efficiency and environment friendliness.

The invention discloses a cellulose fiber-based sandwich structure filter material for removing micro-plastics and a preparation method of the cellulose fiber-based sandwich structure filter material, and belongs to the field of micro-plastic filtration. The preparation method comprises the following steps: (1) uniformly mixing cellulose long fibers and cellulose short fibers, and then carrying out suction filtration to respectively prepare an upper-layer fiber membrane and a lower-layer fiber membrane; (2) preparing a covalent cross-linking mixture from cellulose nanofibers as a base material, a silane coupling agent, an amino-containing polymer and water; (3) coating a fiber membrane with the covalent cross-linking mixture, and assembling to obtain a sandwich structure; and (4) freezing the obtained sandwich structure, and drying at normal pressure to obtain the cellulose fiber-based sandwich structure filter material. The obtained cellulose fiber-based sandwich structure filter material can effectively filter multi-scale micro-plastics in a graded manner, can effectively filter various micro-plastics and micro-plastics in various real water samples, and provides a novel environment-friendly solution for micro-plastic pollution abatement.

The invention discloses pseudoumen and an application of the pseudoumen in polluted environment treatment. According to the invention, a strain of pseudoumen pseudomonas 25S0261-4 is separated from soil and is gram negative bacillus, the optimal growth temperature of the strain 25S0261-4 is 20-40 DEG C, and the optimal pH range is 5-9. Researches show that the strain 25S0261-4 has a good phosphorus-solubilizing characteristic, and can be used as a phosphorus-solubilizing bacterium for increasing the phosphorus content in soil and improving the soil fertility. The 25S0261-4 strain has an efficient degradation effect on PBAT, the degradation effect of PBAT can be further improved when the 25S0261-4 strain is combined with earthworms for treatment, and it is shown that the earthworms can cooperate with the 25S0261-4 strain to degrade PBAT, be used for treating plastic polluted environments and degrading plastic pollutants in soil and have important significance on improving soil quality and degrading the plastic pollutants.

The invention belongs to the field of biodegradable high polymer materials, and particularly relates to a preparation method of degradable antibacterial plastic and application of the degradable antibacterial plastic in meal boxes. The preparation method comprises the following steps: mixing PLA, PHA, a plasticizer and an antibacterial agent, granulating by an extruder to obtain degradable antibacterial plastic, and then carrying out injection molding to obtain the meal box. The PLA and the PHA are blended, so that the rigidity and the low cost of the PLA are retained, and the flexibility and the rapid degradability of the PHA are fused; pHA has antibacterial activity, and the dosage of extra antibacterial agents is reduced after PHA is blended with PLA; according to the invention, the porous spherical ZnO / TiO2 loaded nano Ag is used as an antibacterial agent, has a relatively high specific surface area and can efficiently sterilize, and the porous material can synchronously adsorb peculiar smell molecules or grease volatilized by food, so that the preservation time is prolonged; the meal box formed by injection molding of the plastic has excellent mechanical properties and food safety, is suitable for the field of disposable environment-friendly tableware, and solves the problems of pollution and microorganism breeding of traditional plastics.

The invention relates to the technical field of waste plastic resource utilization, and particularly provides a method for preparing glycollic acid through high-selectivity photoelectrocatalytic oxidation of polyethylene glycol terephthalate (PET) plastic. The core of the method is that a carbon nitride film loaded and modified by heteroatom doping (sulfur / phosphorus and the like) and an oxidation co-catalyst (Ni (OH) 2, NiFeOOH and the like) is used as a photo-anode, and under the conditions of certain bias voltage, electrolyte pH and composition and light source wavelength, PET oxidation is guided to generate glycolic acid with high selectivity. According to the method, efficient conversion from the PET waste plastics to high-value chemicals is achieved, the Faraday efficiency of glycollic acid in the product can reach 75% or above, and an innovative technical path is provided for plastic pollution abatement and waste turning into wealth.

This invention relates to a microbial agent with highly efficient plastic degradation properties and its application, wherein the microbial agent contains *Cryptococcus lauriensis* strain with accession number CCTCC NO: M 2026232. Papiliotrema laurentii SNP7-2P strain and / or Achromobacterium with accession number CCTCC NO: M 2026231 Achromobacter strains FJ1-2L. These two microbial strains exhibit varying degrees of degradation effects on long-chain polymers in plastics, effectively and environmentally addressing plastic pollution and making them suitable for preparing green and environmentally friendly degradable plastic products.

The invention relates to the technical field of data detection, and discloses a micro-plastic pollution abatement effectiveness detection method based on big data coupling. In the aspect of pollution traceability, the method adopts a mode of combining multi-dimensional feature acquisition and a feature evolution model; the problem of traceability failure caused by feature drift in a traditional method is solved, the traceability effective time is prolonged, and the traceability accuracy is improved. In the aspect of migration prediction, the multi-process coupling model and physical and chemical parameter dynamic association mechanism established by the method can accurately simulate complex interaction behaviors in the micro-plastic transportation process, and the prediction error of a migration path is reduced. In the aspect of governance evaluation, the governance process conversion behavior analysis method and the multi-dimensional evaluation system established by the method can accurately distinguish true removal, pollution transfer and form conversion, and the situation that a governance scheme with appearance reaching the standard but the actual risk not reduced is misjudged as an effective scheme is avoided.

The present invention discloses an ecologically friendly disposable product, particularly for packaging and other diverse applications. The matrix of the product is primarily composed of moss and plant materials, offering a significant environmental benefit due to its complete biodegradability, eliminating the issue of plastic pollution and landfill. The unique composition of the product provides antibacterial, antiseptic, and anti-fungal properties, thus enhancing its shelf life and mitigating spoilage concerns. The product demonstrates impressive moisture retention capabilities lasting up to 8-12 hours, remarkable durability, remaining resistant to low temperatures, ultraviolet light, and alcohols, ensuring its functionality in a wide range of environmental conditions. This innovative product is not only highly functional but also adaptable, boasting a flexible design that caters to specific use cases. Notably, the production process includes the utilization of minimally processed nature-based ingredients from the food / wood industry side stream, maintaining the manufacturing process with low costs.

The invention discloses a composite microbial agent for degrading micro-plastics in seawater and a preparation method thereof, the microbial agent is composed of effective viable bacteria and auxiliary components, the effective viable bacteria are marine-derived halomonas, acinetobacter and bacillus and pseudomonas with high affinity with the micro-plastics, the effective viable bacteria are compounded according to a specific viable bacteria number ratio, and the microplastics are degraded by the auxiliary components. And function collaboration is realized. The auxiliary components comprise a protective agent consisting of trehalose, skimmed milk, glycerol and cane sugar, and a nutritional agent consisting of glucose and yeast extract. The preparation method comprises the following steps: respectively fermenting, centrifugally concentrating, compounding in proportion, mixing with auxiliary components, and finally drying to prepare powder. The invention further discloses application of the microbial inoculum to degradation of microplastics in beach intertidal zones and ship wastewater systems. The microbial agent is high in pertinence, good in stability in a high-salt seawater environment and high in degradation efficiency, and an effective solution is provided for in-situ bioremediation of marine micro-plastic pollution.

The application discloses a method for preparing PETG biodegradable copolyester from waste PET polyester. The method comprises the following steps: mixing waste PET polyester, alcoholysis agent and catalyst, heating to perform alcoholysis reaction, controlling alcoholysis reaction conditions to stop the reaction when the PET polyester is depolymerized into an oligomer with a number average molecular weight of 1000-2000 g / mol and a polymerization degree of 5-8, then supplementing monomers, and completing polycondensation reaction under high vacuum conditions to obtain PETG copolyester. The scheme has the advantages of simple process route, small catalyst consumption, no need to supplement catalyst during polycondensation reaction, low energy consumption, realization of conversion of non-degradable PET into biodegradable copolyester, and important significance for relieving plastic pollution problems.

The application discloses a regenerated cationic cellulose-based composite filter membrane and a preparation method and nanometer plastic removal application thereof, and belongs to the technical field of regenerated cellulose water treatment filter materials. In the application, a sodium hydroxide-urea-thiourea ternary system is used to fully dissolve cellulose, the cellulose is modified by 2,3-epoxypropyl trimethylammonium chloride cation, a PVDF membrane is used as a base, and a hydrophilic composite filter membrane is prepared by vacuum filtration and loading of a cationized cellulose layer. The preparation process is mild, and the defects of the traditional cellulose membrane, such as insufficient dissolution, uneven pore size and poor screening precision, are solved. The filter membrane surface is positively charged, the hydrophilicity is greatly improved, the water contact angle is only 39°, the particle size of 50-500 nm carboxylated nanometer plastics can be efficiently intercepted, the removal efficiency of 100 nm polystyrene nanometer plastics reaches 97.01%, and the water flux is excellent. The process is green and low-cost, can remove polystyrene, polymethyl methacrylate and polyvinyl chloride nanometer plastics in a wide range, and has a good engineering application prospect in the field of deep treatment of water body nanometer plastic pollution.

The invention belongs to the technical field of high-value utilization of waste plastics and preparation of lubricating oil. According to the method for preparing the lubricating oil through hydrogenolysis of the polypropylene waste plastics, a supported non-noble metal-metal oxide catalyst is adopted to catalyze hydrogenolysis of the polypropylene waste plastics to prepare the lubricating oil in the absence of a solvent. According to the method disclosed by the invention, the polypropylene waste plastic can be converted into the high-value lubricating oil under low-cost and mild conditions, the problem of waste plastic pollution can be solved, and meanwhile, green and multi-way preparation of the lubricating oil can be realized.

The invention discloses a sea grass preservative film and a preparation method thereof, and relates to the technical field of preservative film preparation. Aiming at the problems of serious pollution and difficult degradation of the existing plastic product, the invention takes sea grass and starch as core raw materials and is prepared by the steps of sea grass raw material pretreatment, extract preparation, gel mixture preparation, calcium ion crosslinking, airing and the like. The seaweed extract and the starch are subjected to synergistic interaction through hydrogen bond physical crosslinking and thermal gelation to form a stable film structure, the raw materials are food-grade, and the seaweed film has toughness and complete degradability, is free of harm to the environment and human bodies, can be widely applied to food packaging, field film covering, packaging products and other scenes, effectively replaces traditional plastic products, and solves the problem of plastic pollution.

This application provides a method for preparing environmentally friendly clothing fasteners made from marine recycled PET, relating to the field of environmentally friendly clothing accessory manufacturing technology. The use of marine recycled PET material in this application reduces the demand for virgin plastics and decreases the consumption of non-renewable resources such as petroleum; it effectively reduces plastic pollution in the ocean and protects the marine ecological environment; compared to virgin PET materials, it saves energy and reduces carbon footprint; marine recycled PET fasteners are derived from the same source as polyester clothing fabrics, enabling "material homogeneous recycling" of clothing; furthermore, the cellulose nanocrystals (CNC) in the reinforcing phase composite are derived from renewable resources and are biodegradable, further enhancing the green sustainability of the environmentally friendly fasteners; the graphene-cellulose nanocrystal CNC composite is compounded and combined in a silane coupling agent ethanol solution to form an interpenetrating network structure, thereby synergistically improving the strength, rigidity, toughness, and heat resistance of marine recycled PET, and increasing tensile strength.

The invention discloses a microplastic distribution prediction and tracing method, and relates to the field of model detection. Collecting multi-source monitoring data of a target water area, and performing space-time alignment processing on the multi-source monitoring data to generate a structured space-time data set; constructing a three-dimensional ocean current dynamic model of the target water area, simulating ocean current field distribution under different time-space conditions by using ocean environment auxiliary data, and extracting ocean current dynamic characteristic data; processing the spatio-temporal data set and the ocean current dynamic characteristic data through a micro-plastic prediction sub-model, and predicting and outputting a micro-plastic diffusion path and a micro-plastic concentration prediction value of each monitoring station; and processing the current micro-plastic distribution data and the ocean current dynamic characteristic data through the micro-plastic tracing sub-model, and predicting and outputting the current micro-plastic distribution backtracked estuary pollution source. According to the scheme, prediction of the micro-plastic diffusion path and tracing of the pollution source are achieved, the micro-plastic diffusion path can be accurately predicted, the pollution source can be accurately traced, and the efficiency and accuracy of marine micro-plastic pollution treatment are improved.

The application discloses a cadmium-resistant proteus mirabilis and application thereof in treatment of composite pollution environment. Priestia megaterium The application provides a PBAT-degrading bacterium, i.e., a proteus mirabilis (S261-3) strain, which can grow at a temperature of 10-50 DEG C and has certain salt and cadmium resistance, and can grow normally in a high-salt or high-cadmium concentration range. Meanwhile, the S261-3 strain has a good PBAT-degrading effect, and can degrade PBAT under cadmium stress, and can be used for degrading plastic pollutants in cadmium-polluted soil. The microbial strain provided by the application has stronger adaptability to a polluted environment, meets the repair demand of a composite pollution site, can be used for comprehensive treatment of microplastic and heavy metal composite pollution, is helpful to improving soil quality and improving land utilization efficiency, and has important practical significance for soil composite pollution repair.

The utility model discloses a turning and rotating type anti-theft milk powder cover, which belongs to the technical field of milk powder covers, and comprises a lower cover, and a first buckling part is arranged on the lower cover; the upper cover is arranged on the lower cover in a turnover manner; the anti-theft piece is connected with the lower cover through a fixing piece; the buckling piece is arranged on the upper cover in a turnover mode, the anti-theft piece is connected with the buckling piece through the easy-to-tear part, a second buckling part matched with the first buckling part is arranged on the buckling piece, and the buckling piece is used for locking the upper cover on the lower cover. According to the milk powder cover, the anti-theft part can be fixed on the lower cover through the fixing part, resource waste caused by the fact that the anti-theft part is independently discarded is reduced, the influence of plastic pollution on the environment is reduced, and sustainable development of the anti-theft part on the milk powder cover is achieved.

The invention discloses a one-pot preparation method of a waste plastic-to-metal organic framework, which comprises the following steps: (1) dispersing polyethylene glycol terephthalate in N, N-dimethylformamide to obtain a mixed solution; (2) mixing the mixed solution with an N, N-dimethylformamide solution of metal salt, adding terephthalic acid, and carrying out a constant-temperature reaction; and (3) after the reaction is finished, centrifuging, washing and drying to obtain the metal organic framework. According to the method, N, N-dimethylformamide is used as a solvent system, and synthesis of the metal organic framework with mild and controllable reaction temperature can be realized through depolymerization of polyethylene glycol terephthalate and autocatalytic reaction of water molecules in metal salt crystal water. The polyethylene glycol terephthalate used in the method can be derived from waste plastic products, the utilization efficiency is high, the obtained metal organic framework is good in advanced oxidative degradation effect, the resource cost of waste plastic can be effectively reduced, and waste plastic pollution control is achieved.

The application discloses modified magnetic wood powder and a preparation process thereof, and is prepared by loading ferroferric oxide particles on the surface of wood powder through in-situ synthesis and combining with modification treatment. The modified magnetic wood powder has good dispersibility in water, can effectively adsorb micro-nano plastic particles in a solution, and can be removed from the solution by using a magnet. The modified magnetic wood powder adsorbed with the micro-nano plastic particles is subjected to hot-pressing forming to prepare functional wood-plastic composite materials with excellent physical and mechanical properties, magnetism, electromagnetic wave absorption and flame retardancy, and realizes the reuse of the magnetic particle materials after adsorbing the micro-nano plastic particles. The application can effectively adsorb and remove micro-nano plastics in water, and simultaneously realizes the high-value utilization of the adsorbed materials, has the advantages of simple operation, low cost and sustainability, and solves the problems of micro-plastic pollution treatment and the reuse of the treated materials.

The application discloses a preparation method of a flame-retardant and antistatic degradable film. The film is prepared by blending PLA and PBAT, wherein the ratio of PLA to PBAT is 1:2-1:3. The PLA / PBAT blending system makes the prepared material have complete biodegradation capacity, which helps to improve the environmental problems caused by plastic pollution. The molecular weight of PLA and PBAT is increased by adding a chain extender, the physical performance and hydrolysis resistance of the material are improved, the crystallinity of PLA and PABT is improved by adding calcium carbonate, and the stability of the blending system is improved.

The invention relates to the technical field of biological medicines, and discloses application of a ZBP1 inhibitor in preparation of a medicine for treating cognitive impairment caused by plastics. Research finds that exposure of a specific dose of nano plastic can activate a ZBP1 signal channel in an organism and promote assembly of a pan-apoptosis small body compound, so that pan-apoptosis cascade reaction with pyroptosis, apoptosis and necrosis characteristics is triggered, and finally hippocampal neuron damage, dysfunction and learning and memory ability decline are caused. Further research shows that expression of key protein of pan-apoptosis can be remarkably inhibited through local injection of the ZBP1 inhibitor to the hippocampus, cognitive function impairment induced by nano-plastics is effectively improved, and the key effect of ZBP1 serving as a core factor in the regulation and control process is defined. Based on the discovery, the ZBP1 inhibitor can be used for preparing the medicine for treating the plastic pollution related cognitive impairment, and a brand new treatment strategy is provided for clinical intervention of the diseases.

The present application relates to the technical field of food packaging materials, and particularly relates to an oil-proof packaging material for food contact paper and a preparation process thereof. The oil-proof packaging material for food contact paper is prepared by the following steps: preparing a citraconic acid fermentation liquor, preparing methyl succinic acid by hydrogenation reaction of the citraconic acid, and preparing the oil-proof packaging material for food contact paper. The present application realizes the full-chain green preparation from straw to bio-based methyl succinic acid, and produces degradable polymer particles on the basis. The bio-based methyl succinic acid endows the oil-proof packaging material for food contact paper with the characteristics of renewability and biodegradability, helps to solve the problem of plastic pollution, and in terms of material performance, the introduction of bio-based monomers can optimize the polymer chain structure, improve the barrier effect of the film on oil, make the film thinner and tougher, and thus improve the oil-proof capacity.

The invention relates to the field of pollution monitoring, and discloses a water body micro-plastic pollution real-time monitoring system based on edge calculation, comprising: a water sample collection module for collecting a water sample from a water body in real time; the water sample detection module is used for detecting the collected water sample and obtaining related parameters of the micro-plastic, and the related parameters of the micro-plastic comprise the particle size, the number and the type of the micro-plastic; the edge calculation module is used for carrying out primary processing and analysis on the micro-plastic related parameters obtained by the water sample detection module and extracting feature information; the communication module is used for transmitting the feature information processed by the edge calculation module to a remote monitoring center; and the remote monitoring center is in communication connection with the communication module and is used for receiving, storing and further analyzing the feature information, judging the water body micro-plastic pollution trend according to a preset pollution threshold value and generating corresponding early warning information.

The invention discloses an ocean micro-plastic particle sorting and enriching integrated device and method based on bidirectional acoustic surface waves, and belongs to the crossing field of an acoustic micro-fluidic technology and ocean environment monitoring. According to the device, an inclined micro-channel design and a standing wave sound field coupling mechanism are adopted, flexible interdigital transducers which are symmetrically arranged in a sorting module are used for exciting surface acoustic waves with specific frequencies, and a high-strength sound pressure standing wave field is formed in a micro-channel. According to the particle size distribution characteristics of micro-plastic particles in the marine environment, efficient sorting of micro-plastic is achieved by accurately regulating and controlling acoustic radiation force parameters. And the sorted micro-plastics are directly introduced into the annular enrichment module, and the sound streaming effect generated by a traveling wave sound field is utilized to realize rapid enrichment of particles. According to the device, the technical bottleneck of sample transfer loss in the traditional method is overcome through the integrated design of the sorting and enriching process, and a high-sensitivity and low-cost pretreatment solution is provided for marine micro-plastic pollution monitoring.

The application belongs to the field of rotary cultivators, and particularly relates to a saline-alkali soil under-mulching land preparation and stubble cleaning machine, which comprises a frame connected with a tractor, a land preparation and stubble cleaning assembly and a main transmission box with a transmission assembly, the land preparation and stubble cleaning assembly is transmissionally connected with a power output end of the tractor through the transmission assembly, the land preparation and stubble cleaning assembly comprises a connecting frame with a secondary transmission box below the mulching film, a single-shaft smashing cutter arranged below the connecting frame, the single-shaft smashing cutter comprises a fixed cutter shaft with an upper end fixedly connected with the secondary transmission box, an annular stirring fin connected with the fixed cutter shaft through a rotating sleeve, the rotating sleeve is located in the secondary transmission box and transmissionally connected with the transmission assembly, the fixed cutter shaft is provided with a cutter located on the inner side of the annular stirring fin, and the connecting frame is provided with a first plow blade at the front end, without breaking or lifting the mulching film, the labor intensity is effectively reduced, the soil micro-plastic pollution is reduced, the soil water evaporation is reduced, and the soil salinization is improved.