The invention relates to the field of fertilizers, and in particular to a mountain tea tree fertilizer additive, which consists of the following components in parts by weight: 20 to 25 parts of straw, 10 to 20 parts of sawdust, 10 to 12 parts of expanded perlite powder, 1 to 2 parts of nitrification inhibitor DMPP (3,4-dimethylpyrazole phosphate), 0.3 to 0.5 parts of tea saponin, 10 to 20 parts of mushroom bran, 2 to 5 parts of silkworm excrement, 1 to 3 parts of littleleaf breynia leaf, 4 to 6 parts of shaddock peel, 1 to 2 parts of EM (Effective Microorganisms) original liquid, 10 to 15 parts of waste edible fungus residue, 15 to 20 parts of furfural residue, 2 to 3 parts of tree peony bark, 1 to 2 parts of negundo chastetree leaf, 2 to 3 parts of typhonium giganteum, 1 to 2 parts of radix aconiti agrestis, 1 to 2 parts of lauric acid and 1 to 2 parts of lecithin. The mountain tea tree fertilizer additive can overcome the defects of the prior art, a preparation method is simple, the utilization rate of the prepared mountain tea tree fertilizer additive is high, the dosage of conventional fertilizers is reduced, nitrogen activity is increased, the original nutrients in soil can be activated, and can be sufficiently absorbed and utilized by crops, the yield of crops is promoted to increase, and the stress resistance of crops is increased. When the mountain tea tree fertilizer additive disclosed by the invention is used along with fertilizer, nutrition is complete, absorption is good, the mountain tea tree fertilizer additive can quickly take effect, the fertilizer can be slowly released, the fertilizer effect is long, and mountain tea trees can thrive.