Wireless sensor node energy supply device capable of being self-powered by heat

The utility model discloses a heat self-powered wireless sensor node energy supply device. Wherein the heat energy conversion device, the voltage stabilization filter circuit and the energy supply module are connected in sequence. The heat energy conversion device and the energy supply module provide energy for the wireless sensor node; the energy supply module comprises a level output module, a voltage judgment module and a charging and discharging module which are connected in sequence, and the level generated by the level output module is input to the voltage judgment module to serve as a reference voltage threshold value of the output voltage of the voltage stabilization filter circuit. Compared with a sensor node powered by a battery, the sensor node provided by the utility model haslonger service life and can monitor the safety condition of the chimney structure for a long time; and the wireless sensor network node voltage source adopts the level output module, belongs to an active node, and can ignore