The invention discloses an automatic grinding device for optical lens. The automatic grinding device for optical lens comprises a grinding mechanism, a feeding mechanism, a loading and unloading mechanism and a controller, wherein the feeding mechanism is positioned on one side of the grinding mechanism, and is connected with the grinding mechanism, the grinding mechanism, the feeding mechanism and the loading and unloading mechanism are all in signal connection with the controller, and the loading and unloading mechanism adopts an automatic and synchronous loading and unloading mechanism. In the grinding device, all action mechanisms are uniformly controlled through the controller and are in intercoordination, therefore, automatic grinding processing to the optical lens is achieved, and relatively higher production efficiency is obtained. Compared with the prior art, the automatic grinding device provided by the invention has the advantages that the structure is simple, the manufacturing cost is low, the operation is convenient, the practicability is strong, and the automatic grinding device is particularly suitable for being used in small and medium-sized enterprises in the production field of optical lens.