The utility model discloses an anti-deflection rope hanger of an oil pumping unit. The anti-deflection rope hanger comprises a lower disc (1), jack screws (2), an upper disc (3), a spherical segment (4) and a hemisphere (5). The anti-deflection rope hanger is characterized in that the lower disc (1) and the jack screw (2) are same as those of the original rope hanger; the center at the top part of the upper disc (3) is provided with the spherical segment (4) which is provided with the hemisphere (5) with the same diameter; and the hemisphere (5) has a central hole (6). The anti-deflection rope hanger has the advantages that the structure is simple, and the manufacture is easy; and when the hanging ropes are not equal in length, a polished rod is prevented from generating the bending stress at the bottom part of a square clamp, the phenomenon of the broken polished rod is prevented, the production cost of crude oil is reduced, the production efficiency of an oil pumping well is increased and the yield of the crude oil is increased.