Abstract: In view of phenomenon of error power-off of leakage protection system caused by interference produced by frequency converter in coal mine, the article analyzed the structure and working principle of frequency converter, and the specific reason of interference in leakage protection system. According the actual situation in coal mine, the article introduced two solutions. These two solutions have different emphasis and can be chosen according to specific conditions. The feasibility of these two schemes has been verified through the method of MATLAB simulation analysis, and the impact of error power-off of leakage protection system for mine caused by interference produced by frequency converter has been solved.