The invention discloses a fruit tree fertilizer with bran as a main component. The fruit tree fertilizer is prepared from the following raw materials in parts by weight: 200-230 parts of bran, 100-120 parts of fermented cotton seed hulls, 120-140 parts of shiitake residues, 20-24 parts of flour, 20-24 parts of bentonite, 12-15 parts of zeolite powder, 12-15 parts of bamboo charcoal powder, 16-19 parts of potassium chloride, 10-12 parts of urea, 4-6 parts of ferrous sulfate, 3-5 parts of zinc sulfate, 2-3 parts of sodium sulfate, 1-2 parts of calcium lignosulphonate, 6-9 parts of an EM (Effective Microorganisms) bacterium agent, 10-15 parts of a soil conditioner, and an appropriate amount of water. With the bran, the fermented cotton seed hulls, the shiitake residues and the like as main raw materials, the fruit tree fertilizer is an organic fertilizer with rich nutrients and contains rich enzyme systems, proteins, carbohydrates, vitamins, mineral substances and the like, thereby having very high economic and social benefits. The added bamboo charcoal powder contains a large quantity of water-soluble mineral substances such as potassium, sodium, calcium and magnesium and has a powerful adsorbing capability, thereby being capable of adsorbing harmful substances such as heavy metals from soil and consequently playing a soil purifying role.