The invention provides a machined round cap. The machined round cap comprises a cap body and a cap opening; the cap body is formed from two pieces of non-woven fabrics or plastic films by virtue of heat sealing; a covered edge is formed at the edge of the cap opening and an elastic band is welded in the covered edge. The machined round cap has the advantages of secure structure, reliable quality, high automation degree, low production cost and the like. Due to the design of the semicircular cap body formed from two pieces of non-woven fabrics or plastic films by virtue of heat sealing, in combination with the automatic production process, the production materials can be greatly saved. The cap body is sheared by use of a special cutting roller after being heat-sealed by use of a heat sealing roller, and the whole process can be carried out through one step and realized automatically. The machined round cap is reasonable in structure and consistent in dimension specification, and thus is convenient for large-scale production by use of a full-automatic machine, and as a result, the manual work links are reduced, the production cost and the waste of the raw materials are reduced and the enterprise competitiveness is enhanced.