The invention discloses a wireless temperature sensor and aims to provide a wireless temperature sensor with a self-power generation function. The wireless temperature sensor comprises a temperature acquisition module, a microprocessor module, a wireless communication module, and a power supply module for supplying power for the whole sensor; the temperature acquisition module is electrically connected with the microprocessor module; the power supply module comprises a piezoceramic vibration power generation sheet, a current induction power generation module, a rectification circuit, an over-voltage protection circuit, a current relay capacitor, a boosting module and a power valve circuit, wherein the rectification circuit is a commutation diode; one end of the piezoceramic vibration power generation sheet is connected with the input end of the rectification circuit, and the other end is connected with the negative input end of the boosting module; the output end of the rectification circuit is connected with the positive input end of the boosting module; the current induction power generation module is connected in parallel with the piezoceramic vibration power generation sheet; and the piezoceramic vibration power generation sheet and the current induction power generation module collect energy to supply power for the whole sensor. The wireless temperature sensor is applicable to a motor temperature measuring system, cable contact temperature measuring and other environments.