The invention provides a dust-free drying machine. The dust-free drying machine comprises a cleaning machine (4) and a drying machine; an air supply cover (3), an efficient air filter element (2) and a fan (1) are arranged above the cleaning machine and the drying machine; the dust-free drying machine is characterized in that the fan (1) supplies air downwards, the main shaft (11) of the drying machine drives a turning wheel to rotate at a high speed, a cleaning basket bracket (10) can be located at a position closest to the efficient air filter element (7) of the drying machine, filtered air flows through the closed sidewall (8) of a drying machine inner turning wheel via the surface of a lens and flows to a fan blade (9) on the lower wall of the drying machine inner turning wheel and then is accelerated to flow to the lower air outlet (12) of the drying machine, and therefore, the air is discharged out of the drying machine and the drying of the lens is completed. According to the dust-free drying machine, in the process when the lens comes out of the last cleaning tank, leaves the water surface and goes into the drying machine, dust in the air is not dissolved in pure water on the surface of the lens, and consequently, the use efficiency of the filtered air is effectively enhanced, the cleanliness of the filtered air is guaranteed and the filtered air is prevented from secondary pollution.