The utility model discloses a high-chloride-ion environment welding structure, and belongs to the field of filling of welding seams formed by special-shaped edge parts of workpieces for brazing or welding connection. The composite plate comprises a composite plate body and a weld joint groove, the composite plate body is formed by compositing a shell and a lining, the weld joint groove is formed in the composite plate body, and the weld joint groove is sequentially provided with a base layer, a transition layer, a coating layer and an alloy coating layer in the direction from the shell to thelining. The utility model discloses a welding structure in a high chloride ion environment. According to the welding structure, a transition layer, a coating layer and an alloy coating layer are sequentially welded on the basis of a base layer; the nickel-based alloy coating adopts a 625 nickel-based alloy coating, so that the delivery period can be shortened, the manufacturing cost can be saved,and under the working condition of eight Krah deep blocks of a Krah gas field, a weld joint and a heat affected zone of equipment cannot be corroded in the long-term use process and cannot be peeled off in a layered manner after long-term use.