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This invention discloses a method for recycling waste polyurethane materials and a method for preparing polyurethane products, belonging to the technical field of waste polyurethane material recycling and reuse. The recycling method includes: a powder preparation stage, where waste polyurethane materials are pulverized using a pulverizing device to obtain polyurethane powder; a premix preparation stage, where the polyurethane powder is mixed with a degrading agent, catalyst, and co-solvent in a specific ratio, and then mixed uniformly using a stirring device to obtain a premix with a certain powder content; and a degradation stage, where the premix is ​​ground, extruded, and sheared using equipment with mechanical shearing and extrusion functions, the reaction process is carried out within a set temperature range, and after the reaction is completed, a degraded polyurethane mixture is obtained. In the method for preparing polyurethane products, part or all of the polyol raw material is taken from the degradation mixture. This invention achieves low reagent consumption, low temperature and short time degradation, no need for gas protection, and no generation of toxic substances such as aromatic amines. The resulting high-performance heterogeneous polyol can be directly used in the preparation of polyurethane products without any post-processing.