The wireless temperature sensor is used to measure the operating temperature at the surface or contact of the high voltage charged object, such as the exposed contact, the copper busbar connection, the outdoor switch and the transformer in the high voltage switchgear. Wireless temperature sensor is composed of temperature sensor, signal modulation and amplification, logic control circuit, wireless modulation interface, etc. In the process of operation on the equipment, the collected temperature signal is sent to the wireless temperature measuring host through the wireless network through the built-in lithium battery.