Welding-leakage-proof device for welding

The utility model provides a welding-leakage-proof device for welding. The welding-leakage-proof device for welding comprises a base, a welding table connected with the upper surface of the base, a support connected with the lower surface of the welding table, a driving air cylinder, a connecting part used for connecting the driving air cylinder with the support, a welding device, a plurality of positioning clamps, a plurality of correlation light sensors, a PLC, a plurality of relays, an indicating lamp, a power switch, a left moving button and a right moving button, wherein the indicating lamp, the power switch, the left moving button and the right moving button are arranged on the side face, opposite to the driving air cylinder, of the welding table, and the left moving button and the right moving button control the driving air cylinder to move. The welding-leakage-proof device is simple in structure and flexible in technology, whether the phenomenon of missing of welding exists or not is detected while welding is conducted, prompting is conducted on a welding spot of missing of welding, and therefore repair welding can be conducted. Missing of welding can be prevented, and the welding efficiency can be improved.