The utility model relates to a take self -checking function's that discharges special insulating boot of cable termination, including the insulating boot, and the insulating cylinder, the system has the control box body on the insulating cylinder, installs copper arch -shaped support in the insulating boot, installs the cable terminal clamping piece respectively on copper arch -shaped support, the spring props piece, copper wire mesh grid and two test leads, is drawn forth by the insulating cylinder under shed behind two test lead each control switch on the control box body. The utility model discloses having carried out the closure processing with cable withstand voltage test process, having stopped accident of human electric shock's when experimental emergence, use through the insulating boot effectively improves the safe distance between the alternate and relative cubical switchboard of cable, and the equipment safety of assurance test in -process realizes simultaneously that remote data gathers, further guarantees operation personnel's personal safety.