The invention discloses a novel welding device. The device comprises a frame seat, a machine body, a rising and falling block, an electric block and an electric joint, wherein the machine body is mounted above the frame seat, and the electric block is arranged in the rising and falling block; a concave embedding groove is formed in the inner bottom of the frame seat, weight balancing blocks are detachably arranged in the concave embedding groove, an insertion groove is formed in the end surface of the right side of the electric block, locking-fixing grooves are formed in the upper and lower inner walls of the insertion groove correspondingly, and sliding grooves extending to both sides are formed in the locking-fixing grooves in a penetrating mode; a cavity is formed in the electric block at the left side of the insertion groove, separating blocks are arranged between the cavity and the extending sections of the left sides of the sliding grooves, a first rotating shaft is arranged at the middle portion of the cavity, second rotating shafts extending to the left and right sides are arranged in the cavity and located at the upper side and the lower side of the first rotating shaft correspondingly, and the extending sections of the right sides of the second rotating shafts penetrate through the separating blocks and are connected with the separating blocks in a rotating fit mode; pushing plates are connected with sliding grooves internally in a sliding fit mode, threaded holes are formed in the end surfaces of the left sides of the pushing plates, and first threaded rods are connected with the threaded holes internally in a threaded fit mode. The novel welding device is simple in structure, convenient to operate, and high in locking stability and safety.