The invention discloses a HVDC grounding switch and a stationary contact component thereof. The grounding switch comprises a base, a moving contact and a stationary contact. The base is hinged with a folding grounding knife-switch which can swing up and down. The moving contact is fixedly arranged at the top of the grounding knife-switch. The stationary contact is located over the grounding knife-switch and is plugged with the moving contact in a matched manner to implement a switching-on when the grounding knife-switch swings upwardly and becomes straight. The grounding switch also comprises a tube bus clamp for suspending the stationary contact fixedly on the tube bus, a upper grading ring connected fixedly on the top of the tube bus clamp, and a lower grading ring connected fixedly on the bottom of the tube bus clamp, wherein the stationary contact is positioned in the line of centers of the upper and lower grading rings. Since the stationary contact is suspended fixedly on the tube bus directly by the tube bus clamp, a post insulator that supports the stationary contact can be omitted so as to reduce a cost and to prevent the manufacture difficulty of the insulator from being increased due to a higher requirement of the DC system on the insulator's creep distance.