Compound fertilizer containing efficient binder and production method of composite fertilizer

The invention discloses a granular compound fertilizer prepared by using modified starch as a binder. The compound fertilizer is characterized by comprising the following raw materials in parts by weight: 15-40 parts of nitrogenous fertilizer, 20-40 parts of phosphatic fertilizer, 20-42 parts of potash fertilizer and 0.5-2.0 parts of binder. The raw materials of the binder consist of 35-45 parts by weight of starch, 1-5 parts by weight of phosphate, 0.1-3 parts by weight of oxidant, 0.1-1 part by weight of coupling agent and 40-60 parts by weight of water. The binder contained in the granular compound fertilizer has good adhesion capability, so the granular compound fertilizer disclosed by the invention has the advantage that adhesive capability is good, the rotary drum granulation pelletizing ratio is high and the material returning rate is reduced; the pertinence is strong and the fertilizer efficiency is completely releases, so that the soil is hard to harden and the yield-increasing effect is prominent; a