Fruit-swelling type microbial fertilizer, and preparation method and application thereof

The invention discloses a fruit-swelling type microbial fertilizer which is composed of the following components in parts by weight: 64-70 parts of an animal blood hydrolysate, 70-80 parts of a chitosan hydrolysate, 5-15 parts of a compound trace element, 55-75 parts of potassium dihydrogen phosphate, 85-105 parts of potassium nitrate, and 655-721 parts of a mixed bacterial liquid. The liquid fertilizer is obtained by mixing uniformly the components. The fertilizer is applied in agricultural crop culture. The fertilizer has the beneficial effects that: the fertilizer improves soil, increases the number of soil microorganisms, improves disease resistance and stress resistance abilities of crops, increases the utilization rate of the fertilizer, reduces the use amount of the fertilizer, promotes plant fruit development, avoids fruit falling, improves a fruit taste, and is conducive to nutrient absorption; and the fertilizer is in a liquid dosage form, can perform root-irrigation flushing application, artificial foliar spraying application, drip irrigation and aircraft navigation operation, and has simple fertilization ways.