Clean room capable of switching cleanness level and air treatment mode thereof

The invention discloses a clean room capable of switching the cleanness level and an air treatment model thereof, wherein a fresh air unit, a circulation unit and an air exhaust unit are arranged in the clean room; the circulation unit comprises two parallelly connected variable frequency circulation units with different powers; and the air exhaust unit comprises two parallelly connected variable frequency air exhausters. According to the cleanness level requirement of the clean room, different operation states can be switched to realize cleanness levels of I, II, III and IV, so that the energy is saved, the consumption is lowered and the use is facilitated.