The invention relates to a plaster for preventing heat stroke, which comprises chrysanthemum, mint, mulberry, burdock, kudzu root, bupleurum, cimicifuga foetida, cicada ecdysis, viter rotundifolia, semen sojae praeparatum, duckweed and plaster matrix, wherein the weight ratio is as follows: 3 to 4 parts of chrysanthemum, 2 to 3 parts of mint, 4 to 5 parts of mulberry, 1 to 2 parts of burdock, 1 to 2 parts of kudzu root, 2 to 3 parts of Bupleurum, 3 to 4 parts of cimicifuga foetida, 2 to 3 parts of cicada ecdysis, 1 to 2 parts of viter rotundifolia, 2 to 3 parts of semen sojae praeparatum, 1 to 2 parts of duckweed and an appropriate amount of plaster. When in use, first, the cicada ecdysis, the viter rotundifolia, the semen sojae praeparatum and the duckweed are ground into fine powder and filtered by a 500-mesh screen for standby use; the chrysanthemum, the mint, the mulberry, the burdock, the kudzu root, the bupleurum and the cimicifuga foetida are added with water, decocted, filtered and concentrated into extract; and the fine powder and the extract are uniformly mixed and the plaster matrix is stirred in the mixture. The plaster for preventing heat stroke has unique prescription, is a traditional Chinese medicine preparation, and is adhered to the navel, prevents headache and dizziness, flustered thirsty, nausea and vomiting and other symptoms caused by heat stroke, has significant therapic effect and no side effect, is only for adults who suffer from heat stroke or people who are easy to suffer from heat stroke, and is not applicable to the heat stroke prevention of children.