The invention relates to a hanging hook for a horizontal safety net and a using method for the hanging hook. The hanging hook for the horizontal safety net comprises a hanging hook, wherein the end of the hanging hook, which is provided with a hook, is hooked to the horizontal safety net; the end of the hanging hook, which is not provided with the hook, is in welded connection with a lower clamping plate of a U-shaped clamp; an upper clamping plate of the U-shaped clamp is hung on the upper surface of a lower flange of an H-shaped steel beam; a fastening screw passes through and is in threaded connection with the lower clamping plate of the U-shaped clamp; and the upper end of the fastening screw is pressed against the lower surface of the lower flange of the H-shaped steel beam. The hanging hook has the characteristics that the hanging hook is easy and convenient to process and can be recycled, and can be widely applied to the construction of laying the horizontal safety net in steel structure engineering; and compared with the conventional hanging hook, the hanging hook has the advantages that: the laying speed and the dismantling speed are high, the hanging hook is easy and convenient to operate, construction cost can be reduced, and construction efficiency can be improved.