The invention relates to high-voltage switch device and a control method thereof, and solves the problem that storage electric quantity is too high due to the fact that an energy storage unit stores energy of various actions at one time in the prior art is solved. The high-voltage switch device comprises a high-voltage switch, a magnetic mechanism and an energy storage unit for supplying power tothe magnetic mechanism. The high-voltage switch device further comprises a power supply which is connected with the energy storage unit in a charging mode through a charging line, and a charging adjusting unit which is arranged on the charging circuit between the power supply and the energy storage unit. The charging adjusting unit is used for acquiring the information of the state switching of the high-voltage switch and obtaining the electric quantity needed by the state switching, and the charging adjusting unit is controlled to charge the needed electric quantity to the energy storage unit. Compared with the prior art, in which the potential safety hazard is high due to the fact that the electric quantity of multiple actions is stored in the energy storage unit, the high-voltage switchdevice has the advantages that the electric quantity of the single operation is stored in the energy storage unit of the high-voltage switch device, and the high-voltage switch device is safer to use.