The invention discloses an efficient organic fertilizer and a preparation method thereof. The efficient organic fertilizer comprises the following components in parts by mass: 55-80 parts of an organic fertilizer, 15-30 parts of urea, 8-13 parts of polyglutamic acid, 20-35 parts of humic acid, 6-12 parts of bamboo carbon powder, 2-5 parts of meat and bone meal, 6-10 parts of jelly bacillus, 2-6 parts of 3% acetic acid, 3-8 parts of nano calcium carbonate powder, 20-30 parts of yellow azalea leaves and 10-15 parts of water hyacinth. The efficient organic fertilizer and the preparation method thereof disclosed by the invention have the advantages that the raw materials are wide in source and harmless, raw material sources can be ensured, the prepared green efficient organic fertilizer is free of environment pollution, lodging resistance, disease resistance and drought resistance of crops can be effectively provided, a high crop absorption rate is achieved, and soil damage is correspondingly retarded.