The invention belongs to the technical field of 
processing of white 
fungus thick soup, and particularly relates to instant white 
fungus thick soup with high dietary fibers and low GI value and a 
processing method of the instant white 
fungus thick soup. The white fungus thick soup is made from the following raw materials in parts by weight: 2-5 parts of chia seeds, 0.5 part of basil seeds, 1 part of dried red dates, 0.5 part of dried Chinese wolfberry fruits, 0.01-0.04 part of 
sucralose, 50-80 parts of fresh white funguses and 100-150 parts of pure water. The fresh white funguses are combined with natural 
plant raw materials of the chia seeds, the basil seeds and the like containing high dietary fibers, and a vacuum 
freeze drying technique is adopted, so that an instant product which is high in dietary fibers, low in 
glycemic index, balanced in nutrients, good in 
flavor and eating mouth feel, good in rehydration properties and easy to store and carry is prepared. The dietary fibers of the instant white fungus thick soup product are greater than or equal to 28g / 100g, the GI value is smaller than 55, after being brewed, the instant white fungus thick soup has fresh, smooth and viscous sense of the white funguses, the 
serum cholesterol can be reduced, the satiety can be improved, the control on 
blood sugar and the weight can be facilitated, and the white fungus thick soup is suitable for fat people and diabetics to eat.