The invention discloses a preparation process of red jujube thick soup. The red jujube thick soup is prepared from the following raw materials by weight: 25-45 grams of red jujubes, 20-35 grams of peach gum, 15-30 grams of Chinese honeylocust fruits, 12-20 grams of white fungi, 15-25 grams of lily bulbs and 11-18 grams of brown sugar. The red jujube thick soup is mainly prepared from the red jujubes, the peach gum, the Chinese honeylocust fruits, the white fungi, the lily bulbs and the brown sugar, has the effects of nourishing the stomach, strengthening the spleen, nourishing the heart, soothing the nerves and moistening the heart and lung, also contains abundant glucose and has sedative and hypnotic effects and blood pressure-reducing effect. A preparation method of the red jujube thicksoup is simple, the process is easy to control, and a product is unique in flavor, can be produced in a large scale and can meet the requirements of market.