Cavity welding positioning device

The invention belongs to the technical field of welding equipment, and particularly relates to a cavity welding positioning device. The cavity welding positioning device comprises a base, an inner supporting unit, an outer supporting unit and a pressing unit; the inner supporting unit comprises a plurality of inner supporting blocks, the inner supporting blocks are used for supporting a cavity from the interior of the cavity, the outer supporting unit is used for supporting the cavity from the exterior of the cavity, and the inner supporting unit and the outer supporting unit are matched to support the cavity; the pressing unit comprises at least one pressing block, the pressing blocks are matched with the inner supporting unit and the outer supporting unit to press and position the part to be welded and the cavity, and the inner supporting unit, the outer supporting unit and the pressing unit are all arranged on the base. According to the cavity welding positioning device, the accuracy of a welding seam in t