Plant straw composite fertilizer and preparation method thereof

A disclosed plant straw composite fertilizer is prepared from the following raw materials in parts by weight: 100-120 parts of plant straw, 40-45 parts of edible fungus residue, 60-65 parts of rapeseed meal, 30-34 parts of rice husk, 30-34 parts of urea, 40-45 parts of diammonium phosphate, 20-23 parts of potassium sulfate, 2-3 parts of zinc sulfate, 2-3 parts of magnesium carbonate, 3-4 parts of EM microbial agent, 4-6 parts of a film-coating agent, and proper amount of water. The fertilizer organically combines major, medium and trace elements with beneficial microbes, is scientific and reasonable in formula, comprehensive and balance in nutrition, is capable of comprehensively supplementing nutrition needed by plants, enabling plants to obtain sufficient nutrition in different stages and radically improving the resistance of crops, and is improved in utilization rate and reduced in fertilizer applying frequency, so that the fertilizer applying amount is reduced and the production cost is reduced. After being used for a long time, the fertilizer is capable of improving soil structure, increasing soil fertility and promoting sustainable development of agriculture.