The invention discloses an interior decoration method achieved through home, furniture and decoration unitary combination three-dimensional modules. According to the interior decoration method, home, furniture and decoration are melted in various three-dimensional modules with proper models, sizes and weights, the three-dimensional modules can be carried by people and are fixedly installed on walls, floors or ceilings in a combination mode, interior decoration and furniture arrangement can be finished simultaneously, no cutting noise, no building rubbish and no rising dust exist on a construction site, onsite assembling time can be shortened to one day due to integration, the modules can be separately arranged or combined, the various arrangement modes of the modules can meet various requirements of men and women and people at different ages, of different heights and with different kinds of work and hobbies, interior decoration is customized and personalized, home life is intelligent and high-end, furniture is foldable, space utilization is optimized to the largest extent, the combined modules are convenient to assemble and disassemble and are recyclable, waste of building materials, panels and the furniture is prevented, more available space is created, occupied space is reduced, expenses of building decoration and the furniture are reduced, and the interior decoration method accords with the principles of green ecology, low carbon, energy conservation and environment protection.