3-methoxy-2-methyl-benzoyl chloride is a key intermediate for synthesizing methoxyfenozide. 3-methoxy-2-methyl-benzoyl chloride was synthesized with 2, 6-dichlorotoluene as the material in the processes of etherification, Grignard reaction, hydrolysis, and acylating chlorination reaction successively, and the process conditions of each of the reaction stages were identified by single-factor experiment N, N-dimethylacetamide was used as the solvent in etherification reaction, the reaction temperature was 130°C, the reaction time was 6.0 h, and the yield was 97.1%. The material ratio in Grignard reaction and hydrolysis was n (CMT):n (Mg)=1:1.05, the reaction time was 3.0 h, carbon dioxide ventilation temperature was -5∼0°C, and the yield was 93.2%. The material ratio in acylating chlorination reaction was n (MMBC):n (SOCl2)=1:1.10, the reaction temperature was 50°C, and the yield was 98.3%. The overall yield was 88.9% and the purity was 99.2% after optimization. The materials for this technol. are cheap and easy to acquire. The reaction route is short, the reaction conditions are moderate, the yield is high, the cost is low, and the technol. is environment friendly and therefore is suitable for industrial production