The invention belongs to the field of construction design, and relates to a method for assembling a temporary small building spliced by paper universal components, namely assembling a building by inserting paper universal components having three different plane modes, bendable bearing paper wall bodies and paper door and windows into a spliced system structure which is attached to the surfaces of structural top and bottom plates and spliced by four same unit structures. The bendable bearing wall bodies are inserted into strip grooves in the periphery and inner side of the splicing system structure to form an outer wall and a partition wall; the paper universal components having different heights and types are inserted into the grooves in the structural bottom plate of the splicing system structure to form a table top, a bed surface and floor; the bendable bearing paper wall body can slide inside the strip grooves and can form a new house type by combining adjustment of the paper universal components. Various living functions including sleeping, cooking, working, dining, washing and the like can be integrated in the spaces. The method is quick, simple and convenient, and the operation can be implemented without specialized persons.