Provided are a specialised fertilizer for an apple tree and a preparation method therefor. The specialised fertilizer is composed of the following components in parts by mass: 20-30 parts of dry sheep manure, 6-10 parts of wood ash powder, 1-3 parts of carbendazim, 10-12 parts of urea, 4-6 parts of ferrous sulphate, 15-25 parts of vinasse powder, 15-25 parts of starch, 10-12 parts of phosphorus pentoxide, 5-7 parts of formaldehyde, and 80-120 parts of water. The specialised fertilizer solves the problems of apples being of a small size, light weight, slow to grow and susceptible to diseases.