The invention discloses a composite for preventing and controlling an agricultural bacterial disease, and belongs to the technical field of plant protection pesticides. The composite comprises an active component A and an active component B, wherein the active component A is benziothiazolinone; the active component B is one or two of cymoxanil, qingkuling, yekuzuo, bismerthiazol, ethylicin, thiram, dioctyl divinyltriamino glycine, active ester, metalaxyl, chlorothalonil, dithiocyano-methane, bromine chlorine hydantoin, 2-bromine-2-nitryl-1,3-propylene glycol and moroxydine hydrochloride; the weight ratio of the active component A to the active component B is 1:100 to 100:1. The composite disclosed by the invention obtains the synergetic effect through the mixing of the benziothiazolinone and other bacterial medications and is used for agricultural production.