Liquid metal spraying device and spraying method thereof

The invention discloses a liquid metal spraying device and a spraying method thereof. The liquid metal spraying device comprises a spray head unit and a control unit. The sprayer unit comprises a bearing piece with an inner space, a container, a piezoelectric valve, a firing pin capable of being driven by the piezoelectric valve, and a nozzle extending downwards from the bearing piece. The control unit comprises a pressure source for supplying pressure to the container, a power supply for supplying power to the piezoelectric valve, and a monitoring module for monitoring the pressure source and the power supply. According to the spraying method, the liquid metal located in the inner space is sprayed to the heating surface or the heat conduction surface through the nozzle by means of the nozzle unit, so that the liquid metal is coated to form the heat dissipation layer. Due to the fact that the inner space of the bearing piece and the inner surface of the nozzle have corrosion resistance, the nozzle can be prev