The invention discloses a beam ring welding tool. The beam ring welding tool comprises a base. A slotting fixing block is arranged on the base, and a clamp is hinged to the slotting fixing block. A vertical rod is arranged at one end of the base and provided with a vertical slotting block, a right-angle fixing plate is arranged at the other end of the base, and a jack is arranged below the right-angle fixing plate. The beam ring welding tool has the beneficial effects that a beam ring can be rapidly and efficiently erected and fixed, and it is guaranteed that welding machining work is efficiently finished with high quality.