Impact-free ball screw auxiliary supporting device

The invention provides an impact-free ball screw auxiliary supporting device. The impact-free ball screw auxiliary supporting device comprises a hook face pressing plate arranged on the bottom face of a movable component, a frame fixedly arranged on a lathe bed of a machine tool and located below a ball screw, a connecting plate connected with the frame through an elastic component so that the connecting plate can move towards or away from the frame, first wheels arranged on the connecting plate and used for supporting the ball screw from the lower portion of the ball screw, and second wheels arranged on the connecting plate. When the hook face pressing plate and the second wheels of the auxiliary supporting device are in a non-contact state, the elastic component is in an expansion state, and the first wheels make contact with the ball screw so as to support the ball screw. When the hook face pressing plate and the second wheels of the auxiliary supporting device are in a contact state, the elastic component