Processing method for tobacco leaves

The invention discloses a processing method for tobacco leaves. The method includes the steps of mixing a carboxymethyl cellulose solution with a ferrous sulfate solution, and conducting a sufficient complexation reaction between carboxymethyl cellulose and ferrous ions to obtain carboxymethyl cellulose complexing iron; mixing the carboxymethyl cellulose complexing iron with a sodium alginate solution to form a composite solution system, producing ferroferric oxide nanoparticles in the composite solution system in situ evenly through pH adjusting and oxidation of oxygen in the air, and obtaining a tobacco leaf processing solution; spraying and coating the tobacco leaf processing solution on the surfaces of the tobacco leaves after fermentation, conducting crosslinking on the surfaces of the tobacco leaves through an irradiation method to form porous hydrogel, and conducting drying processing finally. The tobacco leaves processed by the processing method have the advantages of less harmful components in generated smoke, low irritation, high smoking comfort and good fragrance quality.