The present invention relates to the field of pesticides, in particular to a composition for controlling botrytis cinerea of broccoli, which comprises the following raw materials in parts by weight: 10 to 20 parts of callicarpa bodinieri, 12 to 18 parts of gentiana macrophylla, 12 to 18 parts of Herba Pteridis multifidae, 2 to 8 parts of radix semiaquilegiae, 12 to 18 parts of commelina communis,10 to 20 parts of manyleaf paris rhizome, 12 to 18 parts of Belamcanda sinensis, 2 to 8 parts of Flos Eriocauli, 10-20 parts of Chinese holly, 12-18 parts of tobacco, 8-12 parts of fructus piperis longi, 8-12 parts of polygonum cuspidatum, 3-9 parts of fructus trichosanthis, 8-12 parts of reed rhizome, 6-8 parts of complex bacteria, 10-20 parts of complex amino acid, and 8-12 parts of multi-vitamin. The composition of the invention cannot cause harm to the broccoli, and at the same time, the composition has the good prevention and control effect on the botrytis cinerea of broccoli, the incidence of the botrytis cinerea of broccoli is controlled at 1.23%, the total effective rate of the broccoli infected with botrytis cinerea is more than 95%, and the control effect is remarkable.