The utility model discloses an isolating switch contact cleaning electric brush, and relates to the technical field of electric power system power transformation equipment mounting and maintaining devices. The isolating switch contact cleaning electric brush comprises a cleaning brush body and a power-driven tool, and a connecting shaft at the bottom of the cleaning brush body is detachably connected with a clamping portion at the front end of the power-driven tool; a flexible shaft is further provided, and the two ends of the flexible shaft are detachably connected with the clamping portion of the power-driven tool and the bottom end of the cleaning brush body. The power-driven tool is used for driving the cleaning brush body to rotate instead of linear movement, the problem that processing is not in place due to the fact that the electric brush is limited in narrow space and at high positions can be effectively solved, work efficiency and cleaning effect can be greatly improved, work intensity is lowered, and the electric brush is simple in structure and convenient to use.