Magnetic separation device and method for sulfur dioxide in smoke

The invention discloses a magnetic separation device for sulfur dioxide in smoke. The magnetic separation device comprises a smoke washing cooling tower and a plurality of sets of magnetic desulfurization device units, wherein each set of the magnetic desulfurization device unit comprises a pressurizing pump, an agitating machine, a magnetic separation pipe and a centrifugal machine which are connected in sequence; the magnetic desulfurization device units are divided into various separation grades and various concentration grades. Smoke including oxysulfide or other industrial waste gas is discharged into the smoke washing cooling tower to be washed to cool the washing water to 48-52 DEG C; the washing water passes through the pressurizing pumps and the agitating machines and enters the magnetic separation pipes; under the diffusion effect of opposite magnetic fields of the magnetic separation pipes, sulfuric acid and the water are separated to be close to pipe walls of the magnetic separation pipes, are enr