Novel protective structure of sensor

The utility model discloses a novel protection structure of a sensor. The device comprises an upper shell, a lower shell opposite to the upper shell, and a reducing spring, the upper shell and the lower shell are both shells with openings in the two ends. One end of the upper shell is provided with an internal thread; hollow arrangement of the other end, one end of the lower shell is provided withan external thread matched with the internal thread of the upper shell; blocking protrusion is arranged at the other end of the body, the outer diameter of the blocking protrusion is larger than thediameter of the outer thread. A sensor is arranged in an inner hole of the lower shell, the reducing spring comprises a small-diameter end spring and a large-diameter end spring, the small-diameter end spring is sleeved outside the external thread portion of the lower shell, the large-diameter end spring is sleeved outside the upper shell, after the upper shell is in threaded connection with the lower shell, the small-diam