The invention relates to a disinfecting device, in particular to a disinfecting device used for a Chinese writing brush. The technical problem of providing a Chinese writing brush disinfecting device which saves time and labor, can air the Chinese writing brush after disinfection and enables the Chinese writing brush to be used immediately after disinfection is to be solved. In order to solve the technical problem, the disinfecting device used for the Chinese writing brush comprises a bottom plate, a sliding rail, sliding blocks, connecting rods, a left side plate, a right side plate, a top plate and a disinfectant tank; the left side plate, the sliding rail and the right side plate are sequentially installed at the top of the bottom plate in a bolt connection mode, the sliding blocks are arranged on the sliding rail in a matched mode, the connecting rods are installed at the tops of the sliding blocks in a bolt connection mode, and a fixing device is arranged at the top ends of the connecting rods. Air is sprayed through spray heads and can air the Chinese writing brush while disinfecting the Chinese writing brush, then the Chinese writing brush can be used immediately after being taken down, and wiping cotton swings left and right to disinfect the Chinese writing brush.