The passive wireless temperature measurement device is a temperature monitoring product designed for medium and low-voltage power systems (0.4kV–35kV) and applications with high-temperature requirements. It integrates online temperature measurement and data acquisition functions into a modern high-tech product. All its technical indicators meet national standards. This device can perform online temperature acquisition at contact points (supporting 1 to 48 contact points). It provides an RS485 communication interface to transmit data to the station-end temperature management device or the main station of the temperature measurement system, supports the MODBUS-RTU communication protocol, and allows configurable communication baud rates. The design incorporates multiple anti-interference measures, ensuring stable operation within power systems. The enclosure has an IP20 protection rating, while the sensor is rated IP65.