The utility model relates to an oil pumping unit sliding prevention safety lock hook. The problem that an existing oil pumping unit properly slides and danger happens in the process of maintenance is mainly solved. The oil pumping unit sliding prevention safety lock hook is characterized in that T-shaped threads are arranged in the interior of a nut (3), and turning directions of the threads at two ends of the nut (3) are opposite. One end of the nut (3) is connected with a belt pulley hook (1) through belt pulley hook threads (2), and the other end of the nut (3) is connected with a base hook (5) through base hook threads (4). The oil pumping unit sliding prevention safety lock hook has the advantages of being simple in structure, convenient to use, and capable of being used for preventing sliding events from happening in the process of maintaining the oil pumping unit.