The invention relates to a compressive-deformation-resistant, sweat-absorbent, humidity-eliminating and peculiar-smell-decomposing polyurethane self-skinning foamed plastic for manufacturing insoles. The polyurethane self-skinning foamed plastic, as the name suggests, is prepared by taking PU polyether as a main material, bringing in alkalinity of nano calcium powder to perform neutralization decomposition with smell-making acidic factors excreted by feet, and adopting a special foaming process, and is a foamed plastic material special for a special insole, integrating main functions of resisting compressive deformation, absorbing sweat, eliminating humidity, decomposing peculiar smells and the like.