The decorative wall leather is formed from surface layer and bottom layer, the composition of surface layer comprises PVC base material 100, diisodecyl phthalate 30-60, chlorinated paraffin wax 0-25, barium-zinc liquid compound stabilizer 1-2, azoformamide 0-3, antimony oxide 0-5 and oil soluble dry film mildew inhibitor 0.2-1.5, and the composition of bottom layer contans PVC base material 100, diisodecyl phthalate 40-62, chlorinated paraffin wax 0-25, barium-zinc liquid compound stabilizer 1.5-3.5%, azoformamide 2-6, antimony oxide 2-8 and oil soluble dry film mildew inhibitor 0.2-2. Its preparation process includes the following steps: preparing materials, filtering, first knife coating, drying, secondary knife coating, drying, foaming, stripping, printing, embossing, edge-cutting, check finished product and packaging.