The invention discloses a diacetone amine copper oxalate containing bactericidal composition. The diacetone amine copper oxalate containing bactericidal composition comprises a first active ingredient and a second active ingredient with a weight ratio of (1:15)-(10:1), wherein the first active ingredient is diacetone amine copper oxalate, and the second active ingredient is selected from one of self-protective fungicides such as zineb, mancozeb, trioneb, dithane stainless, propineb, thiram, ziram, chlorothalonil, sulfur and dimethachlon. The bactericidal composition can be prepared into water dispersible granules, wettable powder, suspending agents or dispersible oil suspending agents which are allowed to be used agriculturally, and has the relatively good prevention effect on apple altermaria leaf spot, apple brown spot, cucumber downy mildew, powdery mildew of cucumbers, and potato late blight. The diacetone amine copper oxalate containing bactericidal composition effectively solves the problem that a bactericidal composition adopting the diacetone amine copper oxalate or one of the protective fungicides singly has the poor prevention effect, and has the remarkable synergism due to compounding of the diacetone amine copper oxalate and one of the protective fungicides, and besides, the resistance generation can be delayed.