The invention discloses a high-voltage grounding switch, a high-voltage electric appliance box and a vacuum circuit breaker grounding method. The high-voltage grounding switch comprises a shell, a rotating shaft penetrates through the shell, and the two ends of the rotating shaft extend out of the shell and are hinged to the bottom ends of the two rotating rods respectively. The top ends of the two rotating rods are fixedly connected with a cross rod, and at least three groups of brake reeds are arranged on the cross rod. According to the invention, the input end and the output end of a vacuumcircuit breaker are grounded at the same time through the single high-voltage grounding switch in the limited space of the high-voltage electrical appliance box, and the insulation performance between the vacuum circuit breaker and the high-voltage grounding switch is ensured.