The utility model provides a beam hanger for the polish rod of a belt pumping unit, and therefore, the service life of the polish rod can be prolonged. The beam hanger comprises a load hanging plate for fixing a steel rope, wherein the polish rod passes through the middle part hole of the load hanging plate; an n-shaped part is located on the load hanging plate; the opening of the n-shaped part is downward and faces the load hanging plate; the polish rod passes through the upper top of the n-shaped part; an upper square clamp is arranged above the upper top of the n-shaped part; an anti-falling clip is arranged in the chamber of the n-shaped part; and the upper square clamp and the anti-off clip are respectively fixed on the polish rod. Since the beam hanger for the polish rod of the belt pumping unit is adopted to connect a belt with the polish rod, during the use process, if the polish rod at the root of the square clamp is fractured due to fatigue, the anti-off clip and the load hanging plate still form the complete beam hanger, available for continuous operation. Therefore, the beam hanger for the polish rod of the belt pumping unit can prolong the service life of the polish rod and reduce the maintenance cost.