The invention discloses an automatic rubbing ball feeding device. The automatic rubbing ball feeding device mainly comprises a vibrating disc frame body, a vibrating disc, a bent pipe, a pushing mechanism, a movable rubbing plate, to-be-machined parts of a spherical surface, a supporting plate, a fixed rubbing plate, a machine tool pushing plate and a clamping mechanism, wherein the vibrating discis arranged on the vibrating disc frame body, the discharging opening of the vibrating disc is connected with the bent pipe, the the to-be-machined parts of the spherical surface passe through the bent pipe, and the bottoms of the to-be-machined parts of the spherical surface are arranged in a support groove, namely, the bottom of the to-be-machined parts of the spherical surface are arranged onthe A position in the support groove. The device can achieve automatic feeding, the feeding position is accurate, and the device does not deviate in the feeding movement process. The to-be-machined parts of the spherical surface can be guaranteed to fall into the A position of the support groove, the to-be-machined parts of the spherical surface can be guaranteed to move to the joint of the feeding end of the support plate and the discharging end of the support groove, the position is accurate, and deviation and dumping cannot occur. When one end of a material ejecting rod and one end of an adjusting plate simultaneously push the upper parts and the lower parts of the to-be-machined parts of the spherical surface to move, the to-be-machined parts of the spherical surface can move stably inthe support plate without deviating and dumping.