The invention relates to the field of high-voltage electrical appliances, and particularly relates to a high-voltage switch moving contact mechanism and a high-voltage switch using the same. The high-voltage switch moving contact mechanism comprises a moving contact of which the front end is used as a plugging end. The moving contact is assembled in a guided manner on a guide rail component along the axial direction. In addition, the moving contact is provided with a through hole which runs through along the axial direction, a nut is fixedly assembled in the through hole or at one end of the through hole, a screw is assembled in the nut, and the front end of the screw extends into the through hole of the moving contact. The nut and the screw actually form a screw-nut mechanism, and the moving contact and the nut are fixed together. Therefore, the screw does not do axial movement in the process in which the moving contact is driven by the screw to do reciprocating movement, so that the space needed in the rear part of the screw is reduced, and the problem that an existing high-voltage switch is large in size is solved.