Disclosed is a stable-state automatic-grounded discharge capacitor combination switch which relates to improvement of a combination-switch structure. The utility model provides the stable-state automatic-grounded discharge capacitor combination switch which is long in service life, high in security, and high in capacitor use efficiency. The combination switch includes a CPU control unit, a zero-passage switching control circuit, a zero-passage detection circuit, a drive circuit, a thyristor circuit, a capacitor switching relay and a capacitor discharge relay. Key points of the structure of the switch are that ports of the CPU control unit are connected with a port of a reactive compensation controller, a port of the zero-passage switching control circuit, a port of the zero-passage detection circuit and a port of the drive circuit respectively. Ports of the thyristor circuit are connected with the port of the zero-passage switching control circuit, the port of the zero-passage detection circuit, the port of the capacitor switching relay, a port of a capacitor group and a port of a power grid. Ports of the capacitor discharge relay are connected with the port of the capacitor group and a ground wire respectively.