The invention discloses a welded ball mesh frame locating device for a building house with the long span, and belongs to the field of roof construction of tall buildings. The welded ball mesh frame locating device comprises a plurality of ball holding units and a plurality of connecting mechanisms; the ball holding units comprise ball holding adjusting mechanisms, height adjusting mechanisms and support seats; the ball holding adjusting mechanisms comprise cylindrical shells, large cone gear discs, six holding jaws and three small cone gears; the large cone gear discs are driven to rotate in the cylindrical shells by the three small cone gears, and the six holding jaws are close to or away from the centers of the large cone gear discs simultaneously; the heights of the ball holding adjusting mechanisms are adjusted by the height adjusting mechanisms; the connecting mechanisms comprise two sleeve rings and connecting rods; the sleeve rings rotatably sleeve ring grooves formed in the circumferential surfaces of the cylindrical shells; and the two ends of the connecting rods are correspondingly hinged to the two sleeve rings. According to the welded ball mesh frame locating device forthe building house with the long span, quick locating welding can be conducted on the ground according to the irregular shape of the welded ball mesh frame of a tall building, and the working efficiency and the connecting precision are improved.