The invention discloses a full-automatic dining hall meal selling system. The full-automatic dining hall meal selling system comprises a meal disc distributing machine arranged on a conveying route ofa meal disc transmission mechanism, a meal taking machine, at least one multi-dish-variety distributing machine, at least one single-dish-variety distributing machine and a plurality of meal selecting and taking machines. According to the full-automatic dining hall meal selling system, multiple conveying belts are used for conveying meal discs, work of meal disc distribution, rice distribution, common dish variety distribution, special dish variety distribution and the like can be completed through the meal disc distributing machine, the meal taking machine, the multi-dish-variety distributing machine, the single-dish-variety distributing machine and the meal selecting and taking machines in sequence, the automatic degree is high, and manual operation can be replaced.