The invention discloses a preparation method of dried jujube fruits. The preparation method of the dried jujube fruits comprises the following steps: step one, carrying out pretreatment, namely removing kernels from the jujube fruits, and cutting multiple openings along the length directions of the jujube fruits, wherein each opening extends from the surface of jujube skin to the inside of jujube flesh; step two, carrying out first pre-freezing, namely gradually lowering the temperature from the room temperature to the first pre-freezing temperature at 35 DEG C below zero to 33 DEG C below zero, wherein the temperature reducing rate is 1-3 DEG C/minute; step three, carrying out staged vacuum sublimation drying, namely setting the vacuum pressure at 70Pa and the heating temperature at 80 DEG C and maintaining the conditions for 2 hours, reducing the vacuum pressure to 30Pa and carrying out heating until the temperature is 100 DEG C and maintaining the conditions for 1 hour, and resuming the temperature and the pressure to room temperature and normal pressure, respectively; step four, carrying out second pre-freezing at a pre-freezing temperature of 20 DEG C below zero to 18 DEG C below zero; and step five, carrying out desorption drying at a desorption drying temperature of 40-50 DEG C. The dried jujube fruits prepared by the preparation method are good in taste; and the nutrients are fully preserved.