Abstract: In order to solve the problems of surrounding rock's severe damage and deformation in secondary dynamic roadway of large mining height working face, taking return-air roadway of 112202 working face in Xiaobaodang No.1 coal mine as the engineering background, the main reason for the surrounding rock's failure of the roadway was derived from the stress perspective, mainly caused by the superposition of the lateral stress of the upper section working face and the advanced support stress of the working face of this section.The mechanism of hydraulic fracturing cutting and pressure relief was analyzed, cracks were generated in the roof rock layer through fracturing, which reduced its overall strength and integrity, blocked the goaf stress transmission path, and reduced roof hanging distance.The advanced hydraulic fracturing cutting plan for the secondary dynamic pressure tunnel was proposed, the field test results of hydraulic fracturing roof cutting and pressure releasing technology showed that the approaching distance of the roof and floor of the fracturing section was reduced by about 54.3% compared with the unfracturing section, and the approaching distance of the two gangs was reduced by about 51.1%.The fractured coal stress is reduced by more than 50%.The successful implementation of the research results in the field engineering practice showed that hydraulic fracturing and cutting roof pressure relief technology could significantly improve the stress environment of the secondary dynamic pressure roadway in the large mining height working face and enhance the surrounding rock's stability.