Anti-lost tunnel personnel positioning device convenient to wear

The utility model discloses an anti-lost tunnel personnel positioning device convenient to wear, which comprises a mounting box, the interiors of the two ends of the mounting box are rotatably connected with one end of a bracelet through a hinge shaft, the other end of the bracelet is movably connected through a connecting ring, and when a positioning assembly in the device needs to be replaced, a built-in threaded sleeve is rotated anticlockwise to make the built-in threaded sleeve move upwards, so that the positioning assembly can be replaced. The sliding ring moves upwards under the action of the spring, so that the shifting piece is driven to be separated from the tooth groove of the ratchet wheel outer ring, then the bolt between the cover plate and the mounting box is unscrewed, the cover plate is taken down, and the positioning assembly is replaced; and after replacement is completed, the reel is rotated clockwise to enable the traction rope to be wound on the reel, the situation that the glass observa