The invention discloses an anti-microbial and anti-mildew steaming pad. The anti-microbial and anti-mildew steaming pad comprises glass fiber cloth and a mixed silica gel layer wrapping the surface of the glass fiber cloth. The mixed silica gel layer is prepared from, by weight, 50-70 parts of siloxane simethicone, 10-20 parts of hydroxyl silicone oil, 15-25 parts of dimethoxydimethylsilane, 20-30 parts of titanium dioxide, 5-10 parts of talcum powder, 6-8 parts of an additive, 5-7 parts of trioctyl citrate, 0.01-0.03 part of an organoplatinum complex and 2-4 parts of paraffin oil. In the preparation process of the additive, chitosan is dissolved in an acetic acid aqueous solution, ethyl alcohol is added and mixed evenly, benzaldehyde is dropwise added, the mixture is heated, stirred and subjected to reduced pressure distillation, and a material A is obtained; the material A is purified, and a material B is obtained; the material B, L-lactide and stannous octoate are added into petroleum ether and mixed evenly, the mixture is heated under the nitrogen atmosphere, stirred in a heat preservation mode and purified, and a material C is obtained; the material C is added into a hydrochloric acid aqueous solution to be soaked, the mixture is filtered, a filter cake is taken, and the additive is obtained.