The invention discloses a bactericidal composition containing N,N-diethylphenazine-1-methanamide and N-(3-chloro-5-(trichloromethyl)pyridine-2-methyl)-2,3,5,6-tetrachloro-4-methoxybenzamide, which ischaracterized in that active ingredients of the bactericidal composition comprises the N,N-diethylphenazine-1-methanamide and the N-(3-chloro-5-(trichloromethyl)pyridine-2-methyl)-2,3,5,6-tetrachloro-4-methoxybenzamide, and the mass ratio of the N,N-diethylphenazine-1-methanamide to the N-(3-chloro-5-(trichloromethyl)pyridine-2-methyl)-2,3,5,6-tetrachloro-4-methoxybenzamide is 1:50 to 30:1; the invention belongs to the technical field of pesticides, and preparation formulations of the bactericidal composition include a wettable powder, a suspension agent, a water-dispersible granule, an emulsion in water, a microemulsion, a microcapsule suspending agent, a suspoemulsion and an aerosol; the active ingredients in the bactericidal composition provided by the invention are not simply superposed in interactions in the mass ratio range of 1:50 to 30:1, but synergize with each other; and the bactericidal composition provided by the invention is especially suitable for controlling cucumber powdery mildew and rice sheath blight, and is safe for crops.