High-reliability easily-maintained welding jig

The invention relates to a high-reliability easily-maintained welding jig which comprises a welding jig assembly. The two ends of the welding jig assembly are fixed to a welding positioner; the welding jig assembly comprises two first clack bodies and a two second clack bodies, the first clack bodies and the second clack bodies are symmetrically arranged with respect to the center of a rotating shaft of the welding positioned, and the first clack bodies and the second clack bodies are alternatively arranged in the circumferential direction of the rotating shaft; welding line cork bases extending in the length direction of the first clack bodies are arranged on the first clack bodies, and welding line positioning electromagnets are arranged on the two sides of each welding line cork base; and adjusting devices for adjusting the opposite positions of the first clack bodies and the second bodies so as to change the appearance and size of the welding jig assembly are arranged at the two ends of each first clack b