Disclosed is an enamel liner used for a swirler. The enamel liner is formed by a ground coat and a cover coat through firing. A base material and an auxiliary material are used as aggregate, 18-23 parts of titanium dioxide micro powder of which the particle size is 20-50 nm are added and serve as an additive, and therefore the ground coat is formed. The base material comprises, by weight, 15-25 parts of cobalt oxide and 8-12 parts of zirconium oxide. The auxiliary material comprises, by weight, 4-7 parts of borax, 6-10 parts of sodium nitrates, 9-11 parts of sodium carbonate, 3-5 parts of lithium carbonate, 1.2-1.8 parts of calcium carbonate, 3.6-4.2 parts of magnesium oxide, 4.2-5.2 parts of zinc oxide, 4-4.8 parts of antimony oxide, 2-3 parts of silicon dioxide, 3.8-4.6 parts of nickel oxide and 1.5-2.1 parts of iron sesquioxide. The cover coat is an antimony coat with opaque antimony. According to the liner, an enamel process is applied to the swirler in a transcendence mode, the advantages of abrasion resistance and low water absorption and friction coefficient of an inorganic glassy enamel material are brought into full play, and thus the defects that existing swirler liners are severely abraded and prone to being stuck to the materials and absorbing water are overcome, the separation and classification effects of the swirler are optimized, the working efficiency is improved, and the service life of the swirler is prolonged.