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This invention discloses a biomass porous aerogel, its preparation method, and its applications. The preparation method includes the following steps: S1: Sugarcane bagasse is soaked in an alkaline solution, washed, and its pH value is adjusted to 7; after drying, it is carbonized in an inert gas atmosphere to obtain carbonized sugarcane bagasse fiber; S2: Ti3AlC2 is weighed and etched with LiF and HCl to obtain multilayer MXene material; the multilayer MXene material is sonicated in an inert gas atmosphere, centrifuged, and the supernatant is collected and freeze-dried to obtain MXene nanosheets; S3: MXene nanosheets and carbonized sugarcane bagasse fiber are mixed, hydroxyethyl cellulose is added, and after stirring and freezing, ice crystals are removed in a vacuum to obtain biomass porous aerogel. The biomass porous aerogel prepared by this invention has low density, semiconductor properties, significant reversible compression, and excellent mechanical properties, and also features low thermal conductivity, reusability, and low cost.