The spot welding machine with large battery pack without the need of distribution pump has low noise, fast speed and stable pressure. The equipment has stable performance, reliable welding quality, compact and reasonable structure, small size and large power, and is rated as “fighter” by customers. Specific features: precise microcomputer technical control, can prestored a number of programs, can be changed at will using the double-stage multi-pulse adjustment, can improve the welding output energy waveform, improve the welding ability, make the welding spot firm, beautiful; automatic monitoring and tracking compensation of grid voltage; Idiot box, the equipment operation is simple and easy to learn; digital LED display, equipment parameter adjustment more intuitive easy to learn easy to operate; the design of the rear outlet electrode makes it easier to assemble on the automatic equipment. Optimized structure design, exquisite appearance, compact and reasonable structure, small size and large power; Industrial grade circuit design, circuit safety and reliability.