The invention discloses an organic-
inorganic compound fertilizer and a preparation method thereof. The organic-
inorganic compound fertilizer comprises the following raw materials in parts by weight: 25-30 parts of
green algae, 12-17 parts of
humic acid, 7-12 parts of
bagasse mortar, 8-12 parts of
saw dust, 7-15 parts of
vermiculite, 5-10 parts of
filtration mud, 5-10 parts of
yeast organic waste water concentrated liquid, 5-8 parts of
cane slag, 2-5 parts of sugarcane top and 2-5 parts of microbial strain liquid. The amount of the compound
fertilizer organic matter is large than or equal to 55 weight parts, the total amount of NPK inorganic matters is large than or equal to 12 weight parts, the amount of the
moisture is less than or equal to 25 weight parts, the effective
viable count is large than or equal to 2 hundred million /
gram, and the pH is 5.0-8.5. The preparation method comprises the following steps: fermenting twice by using microbial strains; adding inorganic
porosity vermiculite, evenly mixing, and naturally
drying so as to obtain the organic-
inorganic compound fertilizer. Biodegradable agricultural and industrial production waste water, waste
slag and sugarcane top regeneration organic matters are fully utilized as the raw materials, thereby improving the acidity and basicity of soil, improving the cation exchange capability (CEC) of the soil, improving the utilization of fertilizer, promoting the growth of
crop and increasing the yield of the
crop. The organic-inorganic compound fertilizer has the advantages of good ecological benefits and
circular economy benefits and can be used as an additional fertilizer for crops such as sugarcane, watermelon and the like.