The invention relates to a rust-prevention treatment device, in particular to a hammer rust-prevention treatment device for hardware manufacturing. In order to solve the technical problems, the invention provides the hammer rust-prevention treatment device for hardware manufacturing. The hammer rust-prevention treatment device for hardware manufacturing comprises a bracket, a bottom plate, a thumb air cylinder, a second rotary shaft, a big belt pulley, a second bearing base, an L-shaped connecting rod, a second gear, a first rotary shaft, a first bearing base, a flat belt, a small belt wheel, a second rack, a third slide block, a first rack, a third slide rail, a first supporting rod, a second supporting rod, a slide shaft, a rotary motor and the like; and the second bearing base and the bracket are arranged on the top of the bottom plate. According to the hammer rust-prevention treatment device, the rotary motor rotates to drive a paint sprayer to move rightwards or leftwards to drive the thumb air cylinder to rotate anticlockwise or clockwise, so that uniform paint spraying is carried out on the surface of the hammer, and obvious rust-prevention effect is achieved.