In order to solve the problems of water lock injury and coal powder deposition blocking injury of conventional active hydraulic fracturing fluid in the fracturing construction of coalbed methane reservoir, a new active hydraulic fracturing fluid system suitable for coalbed methane is developed and its performance is evaluated through the optimization and evaluation of anti - swelling agent, waterproof lock agent and coal powder suspension agent. The results show that the pH value, density, surface tension, residue content and compatibility with formation water of the fracturing fluid system can meet the requirements of the industry standard. Compared with the dry coal sample, the coal sample treated by the new active hydraulic fracturing fluid has little influence on the desorption of coalbed methane, which shows that the fracturing fluid system has good water-proof and damage locking performance. When the temperature is 60 ℃, the settling velocity of prop-pant in the new active hydraulic fracturing fluid system is 0. 795mm /s, which shows that the system has good sand carrying performance. In addition, the permeability damage rate of fracturing fluid system to coal core is less than 15%, far less than about 30% of conventional guar gum fracturing fluid, which has good low damage characteristics. The field application results show that the daily gas production of 5 coalbed methane wells is over 1 000 m³ after using the new type of active hydraulic fracturing fluid, which has achieved good fracturing and stimulation effect.