The invention provides a special fertilizer beneficial to potato growth. The special fertilizer is prepared from the following raw materials in parts by weight: 80 to 90 parts of straws, 50 to 60 parts of animal wastes, 20 to 35 parts of plant nutriments, 5 to 7 parts of urea, 5 to 10 parts of monopotassium phosphate, 6 to 10 parts of borax, 10 to 12 parts of plant ash, 10 to 12 parts of iron dichloride, 5 to 6 parts of ascorbic acid, 3 to 5 parts of bamboo charcoal, 5 to 7 parts of amino acid, 1 to 2 parts of EM bacteria, 2 to 3 parts of sodium chloride, 3 to 5 parts of dimethyl propane carboxylate, 0.1 to 0.3 part of diethylaminoethanol caproate, 0.1 to 0.2 part of gibberellin, 5 to 10 parts of calcium carbonate, 0.5 to 0.7 part of 2,4-dichlorphenoxyacetic butyl ester, 4 to 8 parts of soil conditioning agents and a proper amount of water. The special fertilizer has the advantages that the nutrition is rich; the sufficient nutrient can be provided for the potato growth; meanwhile, theefficacies of bacteriostasis, desinsection and weeding are achieved; the odor concentration is low.