The invention discloses a microwave technology based power line patrol road plant removing device, which comprises a magnetron, a controller, an AC power supply, a metal sealed heating chamber and a protection device, and is characterized in that an output end of the AC power supply is electrically connected with an input end of the controller through the protection device, an output end of the controller is electrically connected with an input end of a high-voltage transformer, an output end of the high-voltage transformer is electrically connected with an input end of a circuit rectifier, the output end of the controller is electrically connected with an input end of a cooling fan installed inside the magnetron, the magnetron is installed above the metal sealed heating chamber, an input end of the magnetron is electrically connected with the output end of the controller, the magnetron is provided with a waveguide opening, the metal sealed heating chamber covers the ground with the surface being overgrown with plants, and both sides of the metal sealed heating chamber are provided with a copper wire sealing brush. The power line patrol road plant removing device is high in weeding efficiency, green and environment-friendly.