Fuente: WIPO "tomato" The present invention belongs to the technical field of pesticides and particularly relates to a benzene ring-substituted pyrimidinecarboxylic acid compound, a preparation method therefor, and a herbicidal composition and an application thereof. The benzene ring-substituted pyrimidinecarboxylic acid compound, as shown in the general formula I:wherein, X represents unsubstituted or halogen-substituted alkyl; Y represents OR5; Z represents bromine, haloalkyl, or cycloalkyl; Q represents O or S; R1 and R2 each independently represent hydrogen; R3 represents halogen or amino; R4 represents hydrogen or halogen; R5 represents unsubstituted or halogen-substituted alkyl; W represents hydrogen or its salt, alkyl, alkenyl, alkynyl, cycloalkyl, etc. The compound has excellent herbicidal activity against gramineous weeds, broad-leaf weeds, etc. and is safe and has high selectivity to crops/vegetables such as maize, wheat, paddy rice, oilseed rape, Chinese cabbage, radish, etc.