The invention discloses a novel welding device. The novel welding device comprises a power distribution box, wherein a winding slot is formed in the power distribution box; a winding wheel can be movably mounted in the winding slot; an empty through hole is formed in the left end surface of the power distribution box; a through penetrating hole is formed between the empty through hole and the winding slot; a cable is wound on the winding wheel; a central slot which extends in the vertical direction is formed in the center of the upper end wall of the winding slot; a slide pushing block is movably arranged in the central slot vertically; a first mounting slot which penetrates the central slot is formed in the upper end wall of the central slot; a first threaded hole with an opening end facing towards the first mounting slot is formed in the slide pushing block; a first stud is connected in the first threaded hole in a matched mode; the upper end of the first stud can be movably mounted in the first mounting block and is fixedly equipped with a first toothed circular wheel; the lower end of the slide pushing block is fixedly equipped with a brake sheet and an insertion sheet positioned on the center of the brake sheet; and a sleeve is mounted on the center of the end surface, towards the slide pushing block, of the winding wheel.