The invention discloses an original cheese containing sesame protein and a preparing method thereof, belonging to the technical field of dairy processing. The original cheese is composed of the following components according to quality percentage: 20-25% of total protein and17-21% of fat, and the balance of water. The preparation method is as follows: a part of sesame protein is added in raw milk to replace a part of milk protein, the sesame protein is combined with the milk protein according to a certain proportion, and the cheese is prepared through the fermentation of the lactobacillus and the curding of the chymosin. The cheese prepared in the invention is similar to normal pure milk cheese in terms of physical and chemical characters, and has good quality and taste.