The electric power industry is the basic industry of the national economy. As an insulating control to increase the creepage distance in the electric power link, insulators often reduce their electrical conductivity due to accumulation of surface dirt, resulting in pollution flasking accidents, which cause serious economic impact of electric power and social security impact. The project team designed a mechanical arm for insulator cleaning, which can be mounted on an overhead high voltage power line walking robot to complete the maintenance and cleaning of insulators. The cleaning arm is a separate mechanical cleaning arm, and is designed with an incomplete gear mechanism, which is used to drive both sides of the brush to rotate so as to clean the insulator surface at full Angle. Multi-closed-loop control and PID algorithm ensure attitude adjustment of the multi-degree-of freedom sweeping arm. In conclusion, this project solves the problem of insulator cleaning difficulty, greatly improves cleaning efficiency, and has great research significance and application prospect.