Sensor fixing device

The utility model discloses a fixing device of a sensor. The device comprises a protective sleeve and a locking mechanism, a slotted hole for arranging a sensing line is formed in an inner cavity of the protective sleeve; threaded grooves are formed in the positions, close to the inner ring faces of the locking mechanisms, of the groove holes. An arc-shaped curved surface is arranged on the innerring surface of the slotted hole close to the threaded groove; a through hole used for a sensing line is formed in an inner cavity of the locking mechanism. A hollow screw rod matched with the threaded groove is arranged at the end part of the locking mechanism; an arc-shaped claw matched with the arc-shaped curved surface is arranged at the end part of the hollow screw rod; the protective sleeveis combined with the locking mechanism; the arc-shaped claws are deformed under the limitation of the arc-shaped curved surface by adjusting the depth of the screw rod; the sensor wire is fixed and limited while the sensor is