Sensor fixing device

The utility model discloses a sensor fixing device. Mounting box, a clamping device for fixing the sensor is arranged in the mounting box; the clamping device comprises clamping assemblies which are symmetrically mounted on the upper side wall and the lower side wall in the mounting box; the clamping assembly comprises a supporting block, a rotating shaft, an adjusting block, a sliding block, a connecting rod, a lifting block and a clamping plate. The clamping plate is fixedly mounted on the lifting block; the lifting block is hinged to the two sliding blocks through a connecting rod. The sliding blocks are installed in the sliding grooves in a sliding mode, the sliding grooves are formed in the installation box, the two supporting blocks are fixedly installed on the two sides of the sliding grooves, the rotating shaft is rotatably installed between the two supporting blocks, one end of the rotating shaft extends out of the supporting blocks to be fixedly connected with the adjusting block, the rotating shaft