The utility model discloses an automatic scrubbing calibrating device of turbidity sensor, including light -resistant rotor and the relative a pair of turbidity sensor who sets up, the light -resistant rotor is located between a pair of turbidity sensor, turbidity sensor's camera lens with is the side of light -resistant rotor the rigid body the beformable body contact, be equipped with the thiefhole on the light -resistant rotor, the light -resistant rotor is a certain instantaneous around its self axle center pivoted, the thief hole communicate in in a pair of turbidity sensor's the light path, the light -resistant rotor is driven by drive arrangement. The utility model discloses the light -resistant rotor of automatic scrubbing calibrating device of turbidity sensor through setting upflexible material make between optical emitter and photo -sensor can carry out the automatic clear of pollutant to turbidity sensor's optical lens. The utility model discloses automatic scrubbing calibrating device of turbidity sensor mainly is applied to clearance and calibration that the water turbidity detection waited optical lens's pollution.