Based　on　the　analysis　of　current　temperature　monitoring　technologies　for　high-voltage　equipment,　this　article　develops　a　system　on　the　basis　of　wireless　communications.　In　this　system,　the　MCU　on　the　high　potential　side　communicates　interactively　with　the　low　potential　side　by　means　of　the　wireless　transceiver　modules　on　both　sides,　so　that　the　temperature　signal　of　the　high-voltage　equipment　can　be　sent　to　the　low　potential　side.　This　article　focuses　on　the　following　key　techniques:　the　design　of　the　antenna　made　of　PCB　in　wireless　communications;　the　power　source　based　on　solar　cells　in　the　high-voltage　equipment,　for　which　energy　is　provided　by　the　MCU-controlled　spotlight　on　the　low　potential　side,　which　steadily　produces　a　3.3　V　voltage　through　the　low　power　voltage　control　module;　and　the　parameters　and　the　processing　method　of　a　well-performed　temperature　sensor.　The　tests　in　laboratory　indicate　the　reliability　of　this　system　in　communication.