The utility model relates to a waterline leakage suction shielded welding leaking stoppage device. The waterline leakage suction shielded welding leaking stoppage device mainly solves the problem that as water flows out of a gap between a pipe wall and a leaking stoppage welding piece during existing welding operation in the prior art, the welding operation is not easily finished or can not be finished. The waterline leakage suction shielded welding leaking stoppage device is characterized in that a leakage mouth (2) is formed in a water pipe wall (1) and is covered with a leaking stoppage welding piece, the leaking stoppage welding piece (3) is connected with a drain closing valve (4), and the drain closing valve (4) is connected with a water-gas separation tank (6) and a water ring vacuum pump (7) through a vacuum hose (5). According to the waterline leakage suction shielded welding leaking stoppage device, no water is leaked out of the gap of the welding operation by introducing the vacuum system, and non-stop leaking stoppage of waterlines in production and living is achieved.