The invention discloses a lens edge shaping mechanism. The mechanism comprises a frame and a grinding wheel, wherein the grinding wheel is connected with a driving motor; the frame is a hollow box structure, and is provided with a grinding wheel hole; one part of the grinding wheel extends outside the frame from the grinding wheel hole; a wetting pad is arranged on the outer surface of the frame; the frame is fixed with a water accumulating tank whose bottom surface is higher than the wetting pad; the wall surface or the bottom wall of the water accumulating tank is fixed with a water outlet valve connected to the water accumulating tank through an inlet end; and an outlet end of the water outlet valve is connected with the wetting pad. The mechanism is simple in structure, facilitates to improve the surrounding environment of lens in the lens grinding process, facilitates to reduce the consumption of cooling water in the grinding process, and is higher in grinding precision.