The invention discloses a preservation method of tomatoes. The method comprises the following steps: selecting picked fresh tomatoes of which the red skin accounts for over 100% of superficial area; classifying, namely classifying the tomatoes according to the size; cleaning, namely mechanically cleaning for 2 minutes after using normal temperature water at 10 DEG C, and airing by using an air dryer; vacuum packaging, namely pumping pressure and vacuum packaging under eight barometric pressures; high-temperature sterilization, namely putting the vacuum packaged tomatoes into a sterilization pot, adding water, and raising the temperature to 100 DEG C from normal temperature within 20 minutes; and cooling to normal temperature after preserving heat for 20 minutes, and taking out to obtain the product. No preservative, corrosion remover or pigment is utilized, fresh mouthfeel and quality of red dates can be kept, and the tomatoes can be stored for 24 hours at normal temperature. The preservation method disclosed by the invention is simple in steps, and applicable to practical production, out-of-season selling of the fresh dates in the market can be achieved, the supply time of the fresh tomatoes is balanced, the supply in low and peak seasons is adjusted, the industrial structure of deep processing of the fresh tomatoes is adjusted, the out-of-season price difference of the tomatoes is improved, and economic income of agricultural products is increased.