nRF24LE1wireless transceiver chip is used to monitor the temperature of high voltage switchgear contacts. The high temperature terminal is installed directly on the live part of the HV workplace. The measured temperature is wirelessly transmitted to the monitoring host, which solves the problem of high voltage insulation. The complete monitoring system consists of temperature monitoring terminal, monitoring host and PC. The design achieves real-time monitoring of high temperature contact and ensures reliable operation of high-voltage power switch.