The invention discloses an automatically tracking and remote laser clearing device for a foreign matter of a power grid. In the device, a power supply module is connected with a host of a laser and control system via a power supply wire, the host of the laser and control system is connected with an automatic tracking and collimation module via a composite connection wire, the automatic tracking and collimation module is arranged on a horizontal pedestal, the host of the laser and control system is used for providing a laser light source, a power supply, a control signal to the automatic tracking and collimation module, the automatic tracking and collimation module is used for feeding an collected image back to the host of the laser and control system, after the image is analyzed by the control system of the host of the laser and control system, a control signal is sent to the automatic tracking and collimation module, and the automatic tracking and collimation module adjusts the orientation of a reflector and emits laser. The device and method provided by the invention are high in foreign matter clearing accuracy, capable of automatically tracking and collimating, convenient to operate, low safety risk, short in consumed time, quick and convenient to assemble and disassemble, light in whole weight, and prone to convey.