The invention relates to an anti-slip belt pulley. The anti-slip belt pulley comprises a belt pulley body 1; the outer circle edge of the belt pulley body 1 is provided with strip-shaped teeth 2; thetrend of the teeth 2 is consistent with the axial direction of the belt pulley body 1; the anti-slip belt pulley further comprises an outer ring 3; and the teeth 2 are processed on the outer wall of the outer ring 3. The anti-slip belt pulley has the beneficial effects that the slip of the belt pulley during transmission is reduced, and transmission failure is avoided.