The invention discloses a catering water-saving fine evaluation method based on virtual water. The catering water-saving fine evaluation method comprises the following steps: collecting basic data ofa catering enterprise, wherein the basic data comprises floor space, actual water consumption of each stage, food material consumption, the number of water-saving appliances and building conditions; the catering enterprises are divided into three categories according to the operating properties of the catering enterprises, and each category is divided into five levels from one drill level to fivedrill levels according to the occupied area. Formulating classification standards of each stage of the catering enterprise according to industry conditions; calculating the virtual water amount consumed by food materials in the preparation stage and the virtual water amount of a water-saving appliance in the water-saving stage, and measuring the virtual water amount in the service stage, the equipment operation stage, the cleaning stage and the recycling stage; adding the virtual water amount and the actual water amount of each stage to obtain the total water amount; and calculating the water-saving score of each stage according to the industry water-saving standard of each stage of the catering enterprise and the total water consumption, and further solving the total water-saving score. The water-saving situation of each catering enterprise is evaluated to build a water-saving society.