In order to ensure the stability of the surrounding rock of the unloading chamber in the upper part of No.15 coal bunker, the geological conditions of the unloading chamber were analyzed in detail, and the deformation and plastic zone distribution of the surrounding rock were numerically simulated. The long anchor cable + key part combination anchor cable + fracture zone grouting" support technology, combined with the support principle of unloading chamber, the concrete design of the unloading chamber section 1-1 was designed, and the roadway after support was carried out. The results showed that after the reinforcement scheme,the maximum displacement of the top and bottom plates was 94 mm, the maximum displacement of the two sides was 55 mm, and the anchor cable was evenly stressed, which ensured the stability of the surrounding rock of the roadway.