The invention belongs to the technical field of a traditional Chinese medicine fertilizer, and discloses a water-soluble traditional Chinese medicine fertilizer. The traditional Chinese medicine fertilizer is prepared by amino acid, boric acid and a traditional Chinese medicine decoction; the traditional Chinese medicine decoction is prepared by adding 5-7 times of water in the following traditional Chinese medicines in parts by weight: 9-11 parts of fructus forsythia, 4-6 parts of purslane, 2-4 parts of sophora flavescens, 9-11 parts of celastrus angulatus, 4-6 parts of thunder god vine, 4-6parts of artemisia capillaries, 4-6 parts of dandelion, 4-6 parts of cimicifuga foetida, 4-6 parts of phellodendron amurense, 4-6 parts of bunge corydalis herb, 4-6 parts of scutellaria baicalensis, 4-6 parts of tuber fleeceflower stem, 2-4 parts of Chinese star anise, 2-4 parts of common carpesium fruit, 2-4 parts of artemisia argyi, 4-6 parts of speranskia herb, 4-6 parts of isatis root, and 4-6parts of polygonum aviculare; the amino acid amount accounts for 10% and above of the traditional Chinese medicine decoction weight, the boric acid amount accounts for 2% and above of the traditionalChinese medicine decoction weight. The water-soluble traditional Chinese medicine fertilizer has the effect of promoting growth and controlling insect disease. The invention also discloses a preparation method of the water-soluble traditional Chinese medicine fertilizer.