The invention discloses a 'yi' shape insulating embraced mast for on-load replacement of a high pressure cascade fuse, and relates to an insulating embraced mast. In the prior art, potential safety hazards are large when an operation of 10 kV on-load replacement of the pressure cascade fuse is conducted. The on-load 'yi' shape insulating embraced mast comprises an insulating bar, and wire locking devices which are arranged at the end part of the insulating bar, wherein the insulating bar comprises an upper bar and a lower bar, the middle part of the upper bar and the lower bar is connected through a connecting piece, and the connecting piece comprises a clamping piece used for fixing the insulating rod on a cross arm, a loosening-tightening component used for achieving the looseness and tightness operations of the clamping piece, and a limiting component used for preventing the separation of the upper rod and the lower rod when the clamping piece is loose, the wire locking devices are arranged at the upper end of the upper bar and the lower end of the lower bar. According to the technical scheme, on-load 'yi' shape insulating embraced mast makes it convenient for simultaneous locking of upper and lower leads respectively, and makes it convenient for the replacement of the high pressure cascade fuse; meanwhile, replacement speed and replacement efficiency of the cascade fuse are promoted, metal stress of operation personnel is lowered, and operation safety is improved.