Provided are a cornfield herbicidal composition comprising pyrazolone compounds, and an application thereof. The cornfield herbicidal composition comprises a herbicidally effective amount of active ingredient A, active ingredient B, and safener compound C, wherein the active ingredient A is represented by the following general formula (I); the active ingredient B is one or more selected from the following compounds: triazines, nitriles, sulfonylureas, pyridine carboxylic acids, benzyl carboxylic acids, bentazone, amides, pyridines, and amicarbazone; and the safener compound C is one or more selected from the following compounds: C1 isoxadifen-ethyl, C2 cyprosulfamide, C3 mefenpyr-diethyl, C4 cloquintocet-mexyl, C5 gibberellic acid, C6 furilazole, and C7 N-(2-2methoxybenzoyl)-4-[(methylaminocarbonyl) amino]benzenesulfonamide. The composition can effectively prevent and remove weeds, such as barnyardgrass, crabgrass, and green bristlegrass, in the cornfield, and has the characteristics of extending the weed control spectrum, reducing the application dose, being safe to crops, being able to remove resistant weeds and the like.