The invention provides a captan bactericidal composition, the composition comprises an active ingredient A and an active ingredient B, wherein the active ingredient A is captan, the active ingredient B is selected from one of propamocarb (or propamocarb hydrochloride), cyazofamid, oxadixyl, cymoxanil, metalaxyl (metalaxyl-M), iprovalicarb, fosetyl-aluminum, dimethomorph and dithianon, and the bactericidal composition contains the following ingredients by weight percent: 2-78% of the active ingredient A, namely the captan, 2-78% of the active ingredient B, namely the propamocarb (or the propamocarb hydrochloride), the cyazofamid, the oxadixyl, the cymoxanil, the metalaxyl (metalaxyl-M), the iprovalicarb, the fosetyl-aluminum, the dimethomorph or the dithianon, and the balance of additives and excipients. The bactericidal composition containing the captan and the medicament can effectively reduce the using amount of pesticide, reduce the amount of residue of the pesticide on crops, reduce the environmental pollution and defer the generation of medicament resistance, and is further safe for human and animal and good in environmental compatibility.