The invention provides a soil improvement type 
straw compound organic fertilizer and a preparation method of the soil improvement type 
straw compound organic fertilizer. The soil improvement type 
straw compound organic fertilizer is prepared from the following raw materials in parts by weight: 30 to 35 parts of 
rice straw, 25 to 30 parts of animal excrement, 20 to 25 parts of biological 
charcoal, 10 to 15 parts of 
soybean meal, 5 to 10 parts of cassava residue, 5 to 10 parts of 
diatom ooze, 2 to 2.5 parts of 
plant ash, 2 to 2.5 parts of turfy soil, 2 to 3 parts of 
zeolite powder, 3 to 4 parts of a 
microorganism bacterium agent, 2 to 3 parts of 
sodium benzoate, 2 to 3 parts of 
ammonium monohydrogen 
phosphate, 1 to 2 parts of 
calcium chloride, 1 to 2 parts of 
amino acid, 1 to 2 parts of 
starch, 1 to 2 parts of molasses 
powder and 1 to 2 parts of 
humic acid. The soil improvement type straw compound 
organic fertilizer takes 
plant wastes as raw materials; the quality of soil can be easily improved and the production cost can also be reduced, so that the physicochemical properties of the soil are improved, and the structure of the soil is comprehensively improved, and furthermore, the 
soil quality has the effects of softness, air permeability, 
water retention and fertilizer conservation; the aim of producing an environment-friendly high-quality 
organic fertilizer through preferably selecting heavy 
metal capable of being passivated, the biological 
charcoal capable of improving the fertilizer efficiency of the 
organic fertilizer, and conversion products of organic wastes including the biological 
humic acid and the like as composting base materials, and optimizing a composting process.