Efficient cold air gun

The utility model relates to an efficient cold air gun which comprises a gun body, a hot air pipe, a ventilation inner pipe, a plug and an air passageway, wherein the hot air pipe is arranged on one side of the gun body and provided with a hot air outlet; the ventilation inner pipe is fixedly connected with the gun body and arranged inside the hot air pipe; the plug is arranged on the other side of the gun body and provided with a cold air outlet; and the air passageway communicated the hot air outlet with the cold air outlet through the ventilation inner pipe. The efficient cold air gun can work when an air source is accessed and can be opened and closed in time, the size is small, and the weight is light. The gun cannot produce pollution to the working environment, cannot corrode any part of a machine tool and produce cooling liquids and chemicals such as Freon, ozone and the like, is free from cooling oil contamination, chemical loss or residual, and can increase the turning feed amount and improve the wor