The invention relates to a pressure frame for submerged arc welding machine for thin plate splicing, which includes a half-gantry device, a lifting and rotating device and a double-sided pressure frame device; Guide rail, longitudinal motor reducer, longitudinal wheel set, trolley, transverse guide rail, transverse motor reducer, transverse wheel set, etc., can realize the longitudinal and transverse travel of the pressure frame; the lifting and rotating device consists of a hydraulic station, an oil cylinder, a lifting It is composed of pin shaft, oil cylinder frame, lifting column, guide wheel, slewing bearing, pinion, cycloid reducer, motor, etc., which can realize the lifting and rotating motion of the pressure frame. The longitudinal and lateral movement of the semi-gantry device, the lifting and rotating movement of the lifting and rotating device, and the placement of workpieces in any position and direction are all within the scope of the invention. The two-sided pressure frame is effective and reliable for the two steel plates that need to be spliced. Pressing and cooperating with related welding devices not only ensure the convenience of welding operation and high efficiency, but also ensure the quality of welding.