The invention discloses a steering gear cylinder connector with a seal ring. The steering gear cylinder connector comprises a body which is in a cylindrical structure. The center of the body is provided with a stepped through hole. The bottom of the through hole is provided with an arc cavity. The outside of the bottom of the body is provided with a projection. A groove is arranged below the projection. The seal ring is arranged in the groove. The groove with the seal ring is connected with a cylinder. The connector is supported by the projection, and the periphery of the projection is welded. Therefore, no shifting is guaranteed during the welding process of the connector, and meanwhile, once a gap occurs to the welded part, the seal ring can still ensure no leakage.