The invention discloses an activated-ground-phosphate-rock modified-Chinese-chestnut-protein-coated slow-release fertilizer. The fertilizer is made from the following raw materials, by weight part, 35-38 of earthworm cast, 6-8 of ammonium sulfate, 2-3 of wheat gluten powder, 15-17 of biogas residue, 3-4 of manganese fulvate, 57-60 of ground phosphate rock, 74-78 of fresh Chinese chestnuts, 22-25 of fruits of ficus pumila, 2.3-2.4 of a glutamine transaminase preparation and a proper amount of water. A large amount of in-efficient ground phosphate rock is subjected to calcination and activation, and provides the fertilizer with a large number of medium trace mineral elements. The fertilizer can effectively limit the effectiveness of heavy metal in soil and improve the absorption level of crops. Through addition of organic maters mixed from earthworm cast and biogas residue, the physicochemical property and biochemical property of soil are further improved, the growth potential of crops is regulated and improved, and the yield is increased.