The invention discloses a dish supplying and taking away system for a self-service restaurant. The dish supplying and taking away system comprises a track device, a track changing device, a pluralityof dining carts, a dish supplying lifting platform and a dish taking away device; the track device comprises a conveying track and an outer track; the track changing device comprises a track changingbracket, a first track, a second track, a track changing seat and a track changing moving mechanism; the dining carts include cart frames, placing frames, driving mechanisms, a plurality of pulleys and dining cart material pushing mechanisms; the dish supplying lifting platform includes a base, an electric telescopic rod and a dish supplying material pushing mechanism; and the dish taking away device comprises a plurality of dish taking away hanging baskets, the dish taking away hanging baskets include dish taking away pushing cylinders, dish taking away pushing rods, pushing cylinder fixing seats and hanging basket bodies. The dish supplying and taking away system has the beneficial effects that the unmanned service and self-service of restaurants are realized, and the purposes of savingtime and saving manpower are achieved.