The invention relates to an aeration sustained-release device, belonging to the technical field of sewage treatment. The aeration sustained-release device comprises a water outlet layer (1), a water outlet pipe (2), an aeration pipe (3), an aeration layer (4), sustained-release devices (5), microorganism attachment umbrella fibers (6), a water inlet layer (7), an air outlet pipe (8), a water inlet pipe (9) and ropes (10), wherein the water outlet pipe (2) is connected with the water outlet layer (1); the aeration pipe (3) is arranged in the water outlet layer (1), and the aeration layer (4) is arranged at the upper side of the water outlet layer (1); the aeration layer (4) is internally provided with the ropes (10), and the sustained-release devices (5) and the microorganism attachment umbrella fibers (6) are installed on the ropes (10); the water inlet layer (7) is arranged at the upper side of the aeration layer (4); the air outlet pipe (8) is connected with the water inlet layer (7); the water inlet pipe (9) is connected with the water inlet layer. The aeration sustained-release device is capable of realizing extended aeration according to the need, thus reducing the energy consumption; furthermore, the aeration sustained-release device convenient and simple to install.