The utility model provides an oil field plateau beam -pumping unit adjusting device, therefore, the plateau beam -pumping unit is installed on the beam -pumping unit basis, there is dilatory stake on the beam -pumping unit basis, beam -pumping unit effort hanger is in the top of wellhead assembly, mounting adjustment device in dilatory stake, adjusting device's thrust part withstands the side of plateau beam -pumping unit, utilize the strong point of beam -pumping unit basis some dilatory stakes as the atress, make its effort of exerting on adjusting device be used in on the beam -pumping unit of plateau, it removes to make the plateau beam -pumping unit produce, make it adjust to suitable position, make the center of beam -pumping unit effort hanger and the center coincidence of wellhead assembly, the polished rod of pumpingh well is concentric with polish rod sealing device's axis, inclined to one side mill can not take place, sealing member long service life in the polish rod sealing device, do not need frequently to change the sealing member, the various problems of present existence have been avoided, the oil well can be reduced and the well time is stopped, reduce the oil well management degree of difficulty, improve oil well economic benefits.