The invention provides water-soluble
protein peptide fertilizer. A preparation method of the water-soluble
protein peptide fertilizer comprises the steps that A, firstly, bean pulp is selected as raw materials,
enzyme is added for preparing
soybean protein peptide hydrolysate, then the temperature is reduced to 50 DEG C to 60 DEG C after warming and
enzyme deactivation; B, one or more of
zinc salt,
manganese salt,
ferric salt,
calcium salt and
magnesium salt of medium trace elements are added for a
chelation reaction, and the reaction time ranges from 1.5 hours to 2.5 hours; C, reaction products are concentrated into a concentrated solution of 40% to 60%; D, one or more of nitrogenous
fertilizer, phosphatic fertilizer and
potash fertilizer are added, the reaction continues to be carried out for 1-1.5 hours at the temperature of 50 DEG C to 60 DEG C, and a
liquid product is obtained. The water-soluble
protein peptide fertilizer is mainly composed of various elements and protein peptide, and protein peptide and the various medium trace elements are chelated, so that nutritional ingredients are not likely to run off or be fixed by soil; the
utilization rate can be increased, the
nutrition-allocated proportion is more comprehensive, the fertilizer efficiency is fast and lasting, the soil and surrounding environment cannot be damaged, and agro-ecological balance can be maintained.