The invention relates to the field of rotary type air supply devices, in particular to an automatic rotary type air supply device. The automatic rotary type air supply device aims at solving the problem that an existing air supply opening is easy to deposit ash. According to the automatic rotary type air supply device, the following scheme are proposed, the device comprises an air pipe, wherein two air inlet pipes are connected to the air pipe, a dust blocking cover is arranged at one end, away from the air pipe, of the inlet pipe, the ash blocking cover is of a rectangular structure and is fixedly connected to the inlet pipe, a circular mounting groove is formed in the ash blocking cover, a filter plate is movably arranged in the mounting groove, a fan-shaped filtering opening is formed in the surface of the filtering plate, a filtering screen is covered on the surface of the filtering opening, a rotating shaft is movably connected to the middle of the filtering plate, one end of therotating shaft perpendicularly penetrates through the filtering plate, and the surface of the filtering plate is fixedly connected with a positioning annular sliding rail. According to the invention,the filter plate is arranged at the pipe orifice of the inlet pipe, so that excessive impurities in the air can be prevented during air supply, most of large-particle impurities can be filtered, and the cleanliness degree of the air supply can be guaranteed.