Welding mistake-proofing structure and welding clamp

The utility model relates to a welding mistake-proof structure and a welding clamp, and relates to the technical field of welding. The welding mistake-proof structure comprises a shell assembly, a spring cotter assembly and an inductor. The shell assembly is of a hollow structure internally provided with a containing cavity, and a first limiting structure is arranged in the containing cavity. The spring cotter assembly is arranged on the lower portion of the containing cavity and can slide in the containing cavity, the spring cotter assembly comprises a cotter and a spring arranged on the cotter in a sleeving mode, the cotter is of a rod-shaped structure with the lower portion being a pointed end, a limiting block is arranged on the cotter, and the spring is arranged between the first limiting structure and the limiting block; the inductor is fixed to the upper portion of the containing cavity, and a gap exists between the inductor and the spring cotter assembly. A to-be-detected piece enters the containing c