This bag making machine's feature is suitable for making plastic vest bags of natural color and color-printed. It adopts advanced photoelectric eyes tracking which makes the printing pattern position accurate without error, the sealing synchronous with the heat-cutting without any pulling force and the sealed bottom firm and beautiful. Equipped with variable frequency speed regulating motor, it has other functions such as energy-saving, over voltage and over current protection, etc. And equipped with automatic counting device, it can arbitrarily set the binding quantity and can automatically discharge and reset after the bags are piled to the set quantity.