The invention provides a steel belt automatic adjustment device which comprises a bracket and a rolling device, a controller and a mounting seat which are arranged on the bracket in sequence. Throughposition sensor signals received by the controller, according to programming in a control chip, first motors are controlled to adjust the position of a roller, thus a steel belt passing through the roller meets the measurement requirements of a position sensor, a second motor rotates to make the roller roll, and thus the steel belt is driven, wherein the first motors are linear motors which can directly adjust the position of the roller to reduce the conversion process and ensure the adjustment accuracy. The first motors are arranged symmetrically, the two ends of the roller can be adjusted, adjustment screws are arranged on the bracket to adjust the level and height of the bracket, and thus the position requirements of a production line to the adjusting device can be met. According to thesteel belt automatic adjusting device, the structure is simple, use is convenient, the automation degree is high, and competitiveness of enterprises can be effectively increased.