The invention discloses an automatic design method for a prototype room of a guest-restaurant. The method mainly comprises the steps of dividing room functional areas, packaging furniture into a combination, placing soft furniture according to the combination, adjusting the position of the single piece of furniture and matching hard furniture. The method is not limited to layout design of the softfurniture based on a top view, hard decoration materials of the wall surface, the top surface and the ground are comprehensively considered, and the matching relationship among the materials is reserved; the concept of a guest restaurant functional area is provided, the complex problem of automatic design in the guest restaurant can be split into several sub-problems with low difficulty, the design rationality can be guaranteed, some original arithmetic errors are avoided, and the scheme of automatic design output is attractive and reasonable and truly achieves what you see is what you get. In the divided functional areas, soft decoration matching is carried out with the furniture combination as the granularity, hard decoration matching is carried out with the soft decoration layout as the limitation, the relative position between furniture is reserved, and the relation between soft decoration and hard decoration is also reserved.