The utility model is suitable for an electric power fitting equipment field provides an insulator, and insulator includes: axle form insulator body, locate on the insulator body to the insulator body is centraxonial at least one annular umbrella disk, the both ends of insulator body are equipped with a coupling mechanism who is used for ground connection and locking joint, and are used for accepting highly compressed the 2nd coupling mechanism, and the drive of accessible wind -force, the clean subassembly cleared up is carried out the umbrella disk. The embodiment of the utility model provides an in insulator, drive through installation accessible wind -force on its every umbrella disk and carry out the subassembly that cleans cleared up to the umbrella disk, can be frequently carry out automatic clearance to the filth on insulator surface, not only reduce the probability that flashover, punch -through take place, saved a large amount of manpower and materials moreover, greatly reduced the cost of clearance, in addition, the insulator body is personally experienced sth. Part of the body and both ends coupling mechanism rigid connection, is the insulator body of real core state of insulation, is difficult to puncture, burst, has prolonged insulator's life.