The invention discloses a bactericidal composition. The bactericidal composition comprises an active ingredient A and an active ingredient B, wherein the active ingredient A is benzovindiflupyr, the active ingredient B is selected from one or two of N-(2-(2-chloro-4-trifluoromethylphenoxyl)phenyl)-3-(difluoromethyl)-1-methyl-1H-pyrazole-4-amide and N-(2-(2,4-dichlorophenoxyl)phenyl)-3-(difluoromethyl)-1-methyl-1H-pyrazole-3-amide, and the weight ratio of the active ingredient A to the active ingredient B is [1:50]-[50:1]. The composition can be formulated into conventional preparations such assuspending agent, aqueous emulsion, suspoemulsion, microcapsule suspending agent, suspension seed coating agent, wettable powder, water dispersible granules, granules, effervescent granules, and dispersible oil suspension. According to verification experiments, the composition has reasonable ratio, higher control effect on most diseases of various crops, remarkable bactericidal effect, wide bactericidal spectrum, and obvious synergistic effect.