Protective device for protecting binding post of high-voltage capacitor and use method of protective device

The invention relates to a protective device for protecting a binding post of a high-voltage capacitor and a use method thereof, the protective device comprises an insulating cylinder and an insulating movable end cover, the middle part of the insulating cylinder is provided with a downward concave groove, the top of the insulating cylinder is provided with an opening, the insulating movable end cover is arranged at the opening of the insulating cylinder, and the insulating movable end cover is arranged in the groove. The insulating movable end cover is hinged to the outer wall of the top of the insulating cylinder so that the insulating movable end cover can turn over, and therefore opening and closing of the insulating movable end cover and the insulating cylinder are achieved. By means of the protection device, an operator can conveniently open the insulating movable end cover at the top of the insulating cylinder through an insulating rod to conduct electricity testing and discharging operation, and use i