Underground metal polarization potential intelligent control instrument

The invention discloses an underground metal polarization potential intelligent control instrument. The underground metal polarization potential intelligent control instrument comprises a shell, a control main board provided with a DSP is arranged in the shell, the control main board and a power signal acquisition board are connected in parallel, and the power signal acquisition board includes a pipeline potential collecting end and a ground bed potential collecting end. A positive polarity chopping power output unit, a negative polarity chopping power output unit and a lightning protection output unit are connected to the control main board in parallel, the positive polarity chopping power output unit and the negative polarity chopping power output are separately connected with an alternating current fuse breaker unit and an alternating current input power source sequentially in series, and a pipeline potential acquisition end and a ground bed potential acquisition end are separatelyconnected in series at bo