Environmental-friendly waterproof and breathable clothing leather and preparation method thereof

The invention discloses environmental-friendly waterproof and breathable clothing leather and a preparation method thereof. The preparation method comprises the following steps: adding preparations such as a water-based thickening agent, a defoaming agent, a leveling agent, microporous filler and a curing agent into water-based polyurethane resin, and carrying out mixing and vacuum defoaming to form a water-based polyurethane resin slurry surface layer and bottom layer respectively; and by a processing method with dry-process film transferring, firstly coating release paper with the surface layer, then coating the release paper with the bottom layer after drying and cooling, drying at low temperature, then attaching base cloth at high temperature, drying, curing, cooling, stripping the release paper, bundling, and carrying out surface after-treatment, thereby obtaining the environmental-friendly waterproof and breathable clothing leather. The environmental-friendly waterproof and breathable clothing leather disclosed by the invention has the advantages that the problems of environmental pollution and residue of organic solvents for preparing existing clothing leather are solved, and the water-pressure resistance, the yellowing resistance, the waterproof effect, the breathable function and the like of the clothing leather are improved.