Anti-unhooking lifting hook

The utility model provides an anti-unhooking lifting hook which comprises a straight handle part and a bent hook part, a supporting block is arranged on the straight handle part, a string of adjusting nuts are arranged on the supporting block, an adjusting screw rod is arranged in the adjusting nuts, an adjusting rod and a supporting rod are fixed at the two ends of the adjusting screw rod, a limiting rod is arranged at the far end of the supporting rod, and the limiting rod is arranged at the far end of the supporting rod. A limiting groove is formed in the hook part, and the limiting rod is matched with the limiting groove. The unhooking prevention device overcomes the defect that an existing unhooking prevention device needs to be adjusted manually, labor is saved during adjustment through cooperation of the screw and the nut, resetting can be completely achieved by operating the adjusting rod, the unhooking prevention device is simple in structure and convenient to operate, parts are not prone to being da