The invention discloses anionic automobile skylight ceiling sound-absorbing cotton. The anionic automobile skylight ceiling sound-absorbing cotton comprises a composite fiber layer, a honeycomb layer, a powder filler, a heat insulating layer, a peripheral hook & loop fastener, shock-resistant holes, a first shock-resistant strip and a second shock-resistant strip, wherein a surface layer of the anionic automobile skylight ceiling sound-absorbing cotton is designed into the composite fiber layer, the honeycomb layer and the heat insulating layer serve as an inner layer of the composite fiber layer, internal honeycomb holes of the honeycomb layer are filled with the powder filler, the shock-resistant holes are formed at internal middle positions of the honeycomb layer and the heat insulating layer, and the first shock-resistant strip and the second shock-resistant strip are mounted in the shock-resistant holes. According to the anionic automobile skylight ceiling sound-absorbing cotton disclosed by the invention, the composite fiber layer, the honeycomb layer and the heat insulating layer are arranged from outside to inside, thus, an external heat source can be effectively prevented from entering a vehicle, and noises can be absorbed, filtered and removed; and anions beneficial to human bodies can be released, a comfort level is guaranteed while safety is guaranteed, the designed structure is simple and practical, and the use is convenient.