The utility model relates to a secondary line sweeper mainly comprises air compressor machine, insulating connecting leg, insulated handle, cleaning head. The air compressor machine is connected to insulating connecting leg one end, and the insulated handle is connected to the other end, and the handle front end is equipped with controllable cleaning head, cleaning head has two kinds at straight peen and elbow. This sweeper is applicable to secondary equipment such as all kinds of relay protection of transformer substation screen cabinet, switchgear machinery box, terminal box, outdoor intelligent terminal. This sweeper, accessible are changed it and are connected and realize satisfying the different demands of equipment pollution degree to the cleaning and adjust the air current size through pressure control valve on the insulated handle of secondary equipment dust in the difference narrow and small space. This secondary line sweeper, convenient to carry, easy operation, use are convenient, improve work efficiency greatly, have improved the security that equipment cleaned the maintenance, have practiced thrift the manpower, have alleviateed intensity of labour.