The invention discloses a 2-chloro-benzoate compound which has a novel structure and is shown as the general formula (I), wherein R1 is selected from H or methyl, R2 is selected from H or methyl, and R3 is selected from C1-C6 alkyl or benzyl. When R1 is selected from H and R2 is selected from methyl, carbon atoms connected with R1 and R2 in the general formula are in an S or R structural type. Orthe invention provides a compound which contains different contents of S and R structural types. The compound which is shown as the general formula (I) has extraordinary weeding activity after seedling.