Abstract: To address the issues of low construction efficiency, high labor intensity, and difficulty in meeting the support requirements of gob-side entry retaining for fast-advancing mining faces when using traditional bolt-connected flexible formwork in the construction of gob-side entry retaining with flexible formwork concrete, a new “hooped confined flexible formwork” is proposed. This involves replacing traditional bolts with high-strength fiber ropes, which are pre-sewn into the flexible formwork bag, and combining it with a mechanized formwork-hanging device to form a rapid support technology for gob-side entry retaining. Based on this, a bearing capacity calculation model for the roadside support structure is constructed, and field practice research is carried out using Panel 42305 of the Wanli No.1 Mine as the engineering background. Results from theoretical calculations and field measurements indicate that after adopting the new “hooped confined flexible formwork”, a wall width of 1.2 meters and concrete strength of C40 can meet the on-site support requirements for gob-side entry retaining. Meanwhile, the formwork-hanging time is reduced to one-fourth of the original, and the number of workers required for formwork-hanging is reduced by 2-3. This not only lowers labor intensity but also meets the rapid support demand of 10-15 meters of gob-side entry retaining per day for large-mining-height working faces. It provides a reference for the future development of rapid support technologies for gob-side entry retaining.