The utility model relates to a disc type adjustable dust generator belonging to the scientific research experiment apparatus, and the disc type adjustable dust generator is aimed to solve the disadvantages of the existing dust generator that the dust generating quality is stabel and has a bad adjustment performance. A collar plate provided with several concentric arc recesses of the disc type adjustable dust generator is mounted on a socket box through a bearing, and the collar plate is connected with an electric motor through a gear set. A rubber doctor blade on the surface of the collar plate is connected with one end of a scraper support seat through a clamp, the other end of the scraper support seat is fixed on the socket box, and a conduct pipe bracket fixed on the socket box is connected with an adjustable conduct pipe. One end of the adjustable conduct pipe is connected with a suction hole in the recess, the other end of the adjustable conduct pipe is connected and communicated with the suction end of a blower, and the blowout end of the blower is communicated with a dust generating pipe. The disc type adjustable dust generator can obtain a purpose that the dust is generated with a constant concentration through many modes.