The invention discloses a supporting workpiece electric permanent magnet gripping device, system and method. The supporting workpiece electric permanent magnet gripping device comprises a gripping arm, an electric permanent magnet and a magnetizer, wherein the electric permanent magnet and the magnetizer are arranged on the gripping arm, and the magnetizer is detachably arranged on the surface, away from the gripping arm, of the electric permanent magnet. The supporting workpiece electric permanent magnet gripping device can replace manpower for transferring and an existing mechanical fixture,and manpower can be greatly saved; in addition, the magnetizer and the electric permanent magnet are detachably connected, quick replacing can be achieved, and an appropriate supporting workpiece canbe selected conveniently according to the actual requirements of the supporting hole diameter; and the application range is wide, and the using requirements of heading machines different diameter canbe met.