The invention discloses a fungicide composition and application thereof, and relates to the technical field of pesticide compounding. Active ingredients of the fungicide composition comprise phenazine-1-carboxylic acid A and a fungicide B, wherein the fungicide B is selected from dimethachlon and tridemorph, and the weight ratio of the phenazine-1-carboxylic acid A to the fungicide B is (1:100) - (100:1). According to the fungicide composition, the compounded active ingredients A and B have remarkable synergism and can effectively reduce the application rate of each single reagent; expansion of a bacteriocidal spectrum and slowing of plant fungicide resistance are greatly facilitated, the effect preservation period can also be prolonged, and a remarkable promotional value exists. The fungicide composition can be added with other auxiliary ingredients, which are allowed to be used in pesticides, to be prepared into any agent, and can effectively prevent and control a rice sheath blight disease, rice blast, rice false smut, wheat rust, powdery mildew, wheat root rot, wheat sharp eyespot, soybean root rot, sclerotinia rot of colza, corn head smut, fusarium wilt, downy mildew, pestilence, bacterial angular leaf spot and the like.