Aiming at the problem of large deformation of surrounding rock of gob side entry retaining with flexible formwork wall and slow construction speed, taking the gob side entry retaining with flexible formwork wall of Daliuta Coal Mine 52605 working face as the engineering background, the FLAC^3D numerical model was established, the stress evolution law of surrounding rock of the roadway and the distribution of plastic zone in the process of roadway retaining were analyzed, and the deformation characteristics of the roadway during mining were revealed. The research results show that the front and side solid coal side of the working face are subject to the supporting stress, and obvious stress concentration occurs. The peak stress intensity exceeds 12 MPa, and the stress concentration coefficient is above 2.2; The width of plastic zone of solid coal wall increases from 4.7 m to 9.6 m from 20 m in front of the working face to 50 m behind the working face, and the damage depth increases by 104%; The roadway deformation decreases from the back to the front of the working face, and is protected by the gangue retaining bracket within 20 m behind the working face. The roadway deformation decreases significantly, giving the flexible formwork wall enough time to reach the expected strength. On this basis, the replacement and temporary support technology of the waste retaining support in the gob side entry retaining construction technology is discussed in depth, and the construction process and steps of the waste retaining support preparation, installation and removal are described in detail, which can meet the rapid mining requirements of Daliuta Coal Mine of 12-15 m/d and achieve safe and efficient entry retaining mining. It provides useful reference for the subsequent mining of the mining area.