The invention provides a manufacturing method of a spinning seal head and a seal ring, which is characterized by comprising the following steps: preparing an entire approximately round material with a notch; performing primary spinning seal formation on the material, and cutting to obtain a seal ring; and performing secondary spinning seal formation on the cut material to obtain a seal head. The manufacturing method provided by the invention has the advantages that: the entire production process is continuous and simple, and has high working efficiency; dirt accumulated on the seal ring is easy to clear; the rigidity of the outer container of an insulating tank is enhanced; and the appearance is beautiful.