A cloud platform for welding internet of things is designed,which includes the design of welding equipment layer,edge layer,PaaS layer and SaaS application layer. By collecting real-time status of welding equipment,production process data,production personnel data and welding material consumption data to cloud platform. Data processing and welding service component library is developed,the management and control services of welding operators,welding equipment,welding materials,welding process and welding production,as well as the service functions of data statistics report are realized in the cloud. An extensible open cloud platform service is constructed,which provides open application software service for users.