The invention discloses an agricultural bactericidal composition containing coumoxystrobin and tetraconazole. A weight ratio of coumoxystrobin to tetraconazole is in a range of 1: 30 to 30: 1. The bactericidal composition can be processed to form agriculturally acceptable water dispersible granules, wettable powder, a suspending agent, a dispersible oil suspending agent, missible oil, micron emulsion, a suspending seed-coating agent and poultice. The bactericidal composition has reasonable composition, good bactericidal effects, a low use cost, and activity and bactericidal effects different from simple superposition of activities and bactericidal effects of all ingredients. Compared with the existing single preparation, the bactericidal composition has substantial bactericidal effects and substantial synergism, delays resistance generation, produces less preparation residues, does not produce pollution on the crops, has good safety, satisfies pesticide preparation safety requirements, and has substantial effects of preventing and treating apple tree rotten disease, apple alternaria leaf spot, rice blast, rice sheath blight, sigatoka and wheat sharp eyespot.