Spot welding machine capable of automatically spraying brazing material liquid drops

A spot welding machine capable of automatically spraying brazing material liquid drops comprises a machine base plate, a welding head support, a brazing material melting device, a liquid drop spraying spot welding head, a Z-axis lifting device, a Y-axis moving device, an X-axis moving device and a servo positioning platform, a flexible film is arranged in a counter bore, and the head of a sealing cover is inserted into the counter bore to fix and seal the flexible film. The cooling chamber is connected and sealed with the shell and the sealing cover, the piezoelectric expansion piece is arranged in the shell, the cooling chamber partition pipe is connected and sealed with the shell and the sealing cover, and a driving rod of the piezoelectric expansion piece is fixed and sealed with the flexible film through the cooling chamber partition pipe; the spraying melting cavity is communicated with the brazing material melting device; the Z-axis lifting device, the Y-axis moving device and the X-axis moving device a