The utility model discloses a pumping unit beam hanger retaining plate and belongs to the field of oil field oil recovery machinery. The pumping unit beam hanger retaining plate is mounted on a beam hanger and used for limiting a lifting rope and a polished rod. The pumping unit beam hanger retaining plate is of a combined structure and includes a left retaining plate, a middle retaining plate and a right retaining plate which are split. During use, the middle retaining plate covers the right of the left retaining plate and is fixed with the left retaining plate, the middle retaining plate covers the left of the right retaining plate and is fixed with the right retaining plate, the left retaining plate and the right retaining plate limits the position of the lifting rope, and the middle retaining plate limits the position of the polished rod. The pumping unit beam hanger retaining plate has the advantages that the pumping unit beam hanger retaining plate is of the combined structure, the left retaining plate, the right retaining plate and/or the middle retaining plate can be demounted according to different operations during demounting and mounting of the pumping unit beam hanger retaining plate in maintenance operations, time is saved and labor intensity is lowered due to the fact that the whole beam hanger needs not to be demounted, and work efficiency and oil recovery efficiency are increased.