The invention discloses a welding machine mounting seat which consists of a main frame, a front panel, an oil tank and a battery rack, wherein the oil tank is installed at the upper part of the main frame, the front panel is arranged at the front end surface of the main frame, and the battery rack is fixed on the main frame; the welding machine mounting seat is characterized in that the front panel is positioned at the top right corner or the top left corner of the front end surface of the main frame, the battery rack is arranged under the front panel, and the battery rack is fixed on the bottom surface of the main frame. The welding machine mounting seat has the characteristics that the battery rack is only formed by two parts which are a battery surrounding plate and a limit strip, and is arranged inside the main frame; furthermore, the mounting seat has more compact structure and more convenient manufacture and installation, reduces the volume of a welding machine, and lowers the cost of the welding machine.