Abstract: The invention relates a safety device on the hammer for revolvers which comprises a safety slide (20) guided in a seat (22) formed in the frame (11) of revolver, laterally to the hammer (12) and having a blocking tooth (21) transversely extending between the breech (11') of the frame and the front face (12') of the hammer. The safety slide is movable up and down, to an active upper position and an inactive lower position, and an entraining pin (25) located on the hammer interacts with the safety slide to move it in the inactive lower position when the hammer turns from the armed position to the percussion position.