The utility model discloses a steering gear with a buffer function. The steering gear comprises a base seat, a motor and a ball screw. The base seat comprises a base plate. The end portion of the base plate is provided with a baffle. The motor is fixed on the outer side face of the baffle through a motor seat. The ball screw is arranged at the position corresponding to that of a rotary shaft of the motor in the baffle. The ball screw is connected with the rotary shaft of the motor through a coupler. The steering gear with the buffer function is simple in structure and ingenious in design. Due to the fact that a flexible coupler has certain ability of compensating relative excursion of the axes of two coupled shafts, the flexible coupler of a metal elastic component is good in buffering and vibration reducing performance, large in bearing capacity and suitable for occasions which are large in speed changing and loading changing and in high temperature or low temperature. The motor shaft can not be separated from the ball screw, and the steering gear with the buffer function is convenient to maintain.