The invention relates to a method for preparing nano-particles modified polyurethane shape memory materials, which belongs to the preparation field of memory materials, and utilizes the nano-particles modified polyurethane shape memory materials to change mechanical property and heat resistance, because polyhedral oligomeric silsesquioxane has a nest cage structure, nano size and excellent compatibility with polymers, the method for preparing the nano-particles modified polyurethane shape memory materials can form true sense of molecular composite by modifying polyurethane memory materials, improves heat stability and mechanical strength of memory materials, solves the problems that the polyurethane memory materials are small in recovery force and slow in recovery rate, and also solves the problem that materials are poor in mechanical property and heat resistance.