The utility model relates to the technical field of hairdressing tools, in particular to an automatic rotating hot air comb. The hot air comb comprises a hot air comb body, a comb tooth head is rotatably installed in the hot air comb body, an air outlet is formed in the upper surface of the hot air comb body, a cleaning device is arranged on one side of the comb tooth head and comprises a fixing block, the fixing block is fixedly connected with one side of the comb tooth head, and the fixing block is fixedly connected with the other side of the comb tooth head. A connecting plate is slidably inserted into the fixing block, a fixing rod is fixedly connected to the upper surface of the fixing block, an operation plate is slidably connected to the arc surface of the fixing rod, an inserting rod is fixedly connected to the side, close to the fixing block, of the operation plate, and an inserting groove is formed in the surface of the connecting plate. The problems that after a user uses a hot air comb body to comb hair, a large amount of fallen hair is wound on comb tooth heads, workers are difficult to remove the fallen hair on the comb tooth heads, the use burden of the user is increased, and the use efficiency of the user is affected are solved.