The invention discloses a servo control is used for replacing the traditional mechanical transmission shift gauge device. The device comprises a whole machine equipment, the whole machine equipment isinternally provided with a power output assembly, wherein the power output assembly comprises a servo motor, the servo motor is in power connection to the whole equipment arranged outside the gear connecting component, the whole equipment is externally provided with a fixed seat, a encoder support is fixedly arranged on the fixed seat, wherein the encoder support is internally provided with an encoder, and the encoder is connected with the gear components are attached. The servo control is used for replacing the traditional mechanical transmission shift gauge device, a periodic signal is collected for the power law of the whole production line, according to the designed mathematical model, a control power output part, a pair of rear section carrying out accurate speed ratio control, in order to ensure the required heat gauge after the page number, the accuracy and the reliability, reducing the manufacturing specification wheel specification change cost, and shorten the time wheel, more intelligent, humanized, convenient operation.