Air supply system and variable resistance filter module thereof

The utility model discloses an air supply system and a variable resistance filter module thereof, the variable resistance filter module comprises a frame part (10), a filtering part (20) and a driving part (30), the filtering part (20) is movably mounted on the frame part (10), the driving part (30) is mounted on the frame part (10) and used for driving the filtering part (20) to move relative to the frame part (10), and the driving part (30) is mounted on the frame part (10) and used for driving the filtering part (20) to move relative to the frame part (10). The filtering part (20) can be switched between a working state in which the filtering part (20) provides the maximum resistance for gas flowing through the variable resistance filter module and a non-working state in which the filtering part (20) provides the minimum resistance for the gas. According to the variable-resistance filter module, the filtering part can be selectively moved through the driving part according to the air purification requireme