The invention discloses an advanced hydraulic support flexible roof-contacted mode and top beam structure which adapt to uneven tunnel roof conditions and an anchor net support system. Hydraulic supports are dispersed and arranged on the advanced hydraulic support top beams, group control is conducted by taking a single top beam as a unit, and parallel control is conducted on hydraulic support bearing cavities in groups to form flexible support units. The hydraulic supports inside the flexible support units adopt double-acting hydraulic cylinders, centralized control is conducted by a reversing valve through a hydraulic-control check valve, and an active roof-contacted mode is formed; a single-acting stand column is adopted, centralized control is conducted by the reversing valve through the hydraulic-control check valve to form a passive roof-contacted mode. The number, height and position of the hydraulic supports are determined through anchor cable layout and tunnel roof unevenness. Accordingly, the flexible support units are subjected to asynchronous top touching and synchronous pressurization, all contact point pressure is uniform, support components such as anchor cables and anchor bolt supports are effectively avoided, the synergistic effect of the tunnel anchor net support system and an advanced support is effectively exerted, and safety and high efficiency of the advanced support system are guaranteed.