The invention discloses a manufacturing method of a kettle. The manufacturing method comprises the following steps of: a, taking a
pipe for water swelling; b,
cutting to obtain a kettle mouth blank with a small convex part, then shaping, and
cutting again to form a kettle mouth; c,
cutting the kettle mouth blank to obtain a kettle mouth connecting body, and then turning a connecting step; d, taking an inner container, aligning the kettle mouth connecting body with the inner container, and then
welding; e, taking a shell, aligning the shell with the connecting step, and then
welding; f, taking a shell bottom, aligning the shell bottom with the shell, and then
welding to obtain a kettle body semi-finished product; g, carrying out vacuumizing operation to form a vacuum layer; and h, taking a
handle, and connecting the
handle with the shell and the kettle mouth connecting body to complete the manufacturing of the kettle. Through the steps, when the kettle with the kettle mouth is manufactured, scratches such as drawing wires cannot be formed on the surface of the kettle mouth, the deformation of the inner container and the shell cannot be caused, and the welding position of the inner container and the shell cannot be damaged, so that the kettle mouth with a
smooth surface can be obtained, and the heat preservation effect of the obtained kettle can be guaranteed.