The invention discloses a pressure-tight test device of insulation and protection equipment. The pressure-tight test device comprises a high-voltage power supply and an insulating support, wherein a current-conducting rod connected with the high-voltage power supply is erected on the insulating support, a water tank is placed below the current-conducting rod, copper rods which protrude to the water tank are connected on the current-conducting rod by hooks and iron chains; blocking gates are further arranged in the water tank and are movably connected on a ledge of the water tank. By adopting the high-voltage power supply, a plurality of insulating boots or insulating gloves can be conducted for a pressure-tight test at the same time, therefore, the detection efficiency and safety can be improved.