The invention provides a fixed welding clamp for a battery lug. The clamp comprises a battery cell supporting plate. An upper clamping mechanism and a lower clamping mechanism are arranged on at leastone end of the battery cell supporting plate. The upper clamping mechanism comprises a first mounting seat and a first lifting seat. A first reset mechanism which enables the first mounting seat to have a trend of moving toward the center of the battery cell supporting plate all the way is arranged on the battery cell supporting plate, a second reset mechanism which enables the first lifting seatto have a trend of moving downward is arranged on the first mounting seat, the first mounting seat is provided with a battery cell fixing assembly, an upper lug leaning rod is arranged on the first lifting seat, the lower clamping mechanism comprises a second mounting seat and a second lifting seat, and a lower lug leaning rod corresponding to the upper lug leaning rod is arranged on the second lifting seat. Lugs can be supplied in advance, so that the lugs can be welded directly, and therefore, the production period is shortened, and the process beat of the whole equipment is accelerated. The battery cell and the lug are unlikely to be pressed, so that waste of resources is avoided and the production cost of an enterprise is lowered.