The invention relates to a wireless sensor for a freezing state of a high-voltage transmission line. The wireless sensor is characterized in that the wireless sensor comprises an emission device and a receiving device; the emission device comprises an ice coating weight induction hammer, an ice coating weight sensing element, an ice coating weight conversion amplifier, an A/D convertor for receiving a signal output by the ice coating weight conversion amplifier, a microprocessor for receiving the signal output by the A/D convertor, a wireless communication module for receiving the signal output by the microprocessor, and an emission antenna for transmitting the signal which are arranged on a high voltage transmission line tower; the receiving device comprises a receiving antenna, a singlechip, an amplification processor for receiving the signal of the receiving antenna, a function expander of the singlechip, an online editor, a network server, a display screen for displaying the signal output by the singlechip, and a keyboard for inputting the signal to the singlechip; and the wireless sensor comprises a direct current power supply for providing working voltage for the device. Thewireless sensor can effectively monitor the freezing state of the high-voltage transmission line at any moment, designedly arranges power cut, thaws ice coated on the line, reduces harm to manpower, material resource and equipment caused by power cut prerun, and has great application market.