The present disclosure discloses an active compensating hydrostatic bearing which includes a body, a mass block and a elastic member. The body includes a compensation hole and holds the mass block and the elastic member inside. The elastic member is put between the mass block and the compensation hole for generating a compensation gap near the compensation hole. By resisting the compression from the mass block, the elastic member can control the compression of the compensating gap so as to stabilize the rigidity of the bearing. |