The utility model discloses a cascading-type high-voltage inverter pre-charging circuit which comprises a power grid and a transformer. The primary side of the transformer comprises three phases which are respectively in electrical connection with the power grid. The circuit also comprises a resistor, a first switch, and a second switch, wherein the resistor and the first switch are in parallel connection. One phase of the primary side of the transformer is connected with the power grid through a wire. The resistor and the second switch are respectively disposed between the other two phases of the three phases of the primary side of the transformer and the power grid. Before a high voltage is connected, the first and second switches are disconnected. After the high voltage is connected, two phases, which are connected with the power grid, in a cascading-type high-voltage inverter carries out pre-charging for the cascading-type high-voltage inverter, and the resistor plays a role in limiting a current, thereby reducing a pre-charging current and guaranteeing the safety of equipment. Meanwhile, the cascading-type high-voltage inverter, compared with a conventional inverter, is smaller in size, and is simpler in pre-charging circuit which is needed.