The invention relates to the technical field of welding, in particular to a welding pressing tool which comprises a machining table. A placing plate is arranged in the center of the upper end face of the machining table, three movable plates are annularly arranged on the outer side of the placing plate at equal intervals, and three pressing mechanisms are arranged on the inner side faces of the three movable plates at equal intervals. Each pressing mechanism comprises first-stage hinge seats, sleeves, spring grooves, first-stage springs, movable rods, second-stage hinge seats, a supporting block, a third-stage hinge seat, a rubber pad, a clamping plate and second-stage springs. Rectangular grooves are symmetrically formed in the left side and the right side of the center position of the inner side face of each movable plate, and sliding blocks are arranged in the rectangular grooves correspondingly. The second-stage hinge seats are fixedly connected to the left sides and the right sides of the front side faces of the supporting blocks correspondingly, and the front ends of the movable rods are hinged to the second-stage hinge seats correspondingly. According to the welding pressing tool, the pressing mechanisms are pulled by a pressing driving mechanism to contract inwards, so that a welding workpiece is pressed, manual operation is avoided, time and manpower are saved, and the working efficiency is improved.