The invention relates to a chassis/earthing switch control circuit of a medium-voltage switch cabinet. A main processor circuit is connected with one path of monitoring protection circuit, wherein the monitoring protection circuit comprises an A/D conversion circuit and a current sensor; the current sensor is used for collecting a motor current; the current sensor is connected with the main processor circuit through the A/D conversion circuit; the other path of monitoring protection circuit is also arranged and comprises a logic processing circuit, an isolating circuit and a corresponding detection circuit; the detection circuit is connected with a drive circuit and is used for forming corresponding logic signals according to output of the drive circuit and feeding these logic signals into the logic processing circuit through the isolating circuit; the logic processing circuit carries out judgment according to the input logic signals; and the judgment result is also used for generating a trigger control signal. According to the control circuit provided by the invention, the monitoring protection circuit is divided into two paths; and the motor condition is comprehensively analyzed, so that the reliability is greatly improved.