A safety belt suspension device for balance adjustment of an oil pumping unit belongs to a safety protection device of an oil pumping unit in an oil field, and enables problems with the prior art to be solved. The safety belt suspension device comprises an upper clamp, a lower clamp, a tube, a bracing, blocking nails and steel rings. The upper clamp is clamped on the upper portion of the connecting rod of the oil pumping unit. The lower clamp is clamped on the lower portion of the connecting rod of the oil pumping unit. The lower clamp is provided with the tube. The bracing is connected with the upper clamp and the tube to form a triangular support. The plurality of blocking nails are welded on the tube. The steel rings are sleeved on the tube. When the safety belt suspension device is used, the safety belt is hung on the steel rings so as to slide back and forth, and also to slide in a small scope once a high-altitude falling occurs. The device is detachable so as to be removed and taken away after the work is finished, without breaking the connecting rod of the oil pumping unit. Besides, the device is a triangular support so as to able to bear relatively heavy weight. The height of the device can be controlled by people, and the device accord with the principle that a safety belt is hung at a high place while a worker is working at a lower place.