The present invention provides a triazole compound having a structure represented by a formula (A), or a pharmaceutically acceptable salt, a stereoisomer, a prodrug molecule, a metabolite, or a solvate thereof. The compound can effectively inhibit kinase, especially FLT3 kinase, so as to regulate activation of a plurality of downstream pathways. The compound can be used for preparing medicines forpreventing and treating various diseases related to FLT3 kinase, such as leukemia, tumors, psoriasis, benign prostatic hyperplasia and metabolic diseases, etc.