One-way permanently-locked enclosed cable joint

A one-way permanently-locked enclosed cable joint comprises a sealing sleeve, and two ends of the sealing sleeve are in threaded connection with screw blocks. According to the one-way permanently-locked closed cable joint, a one-way ratchet wheel is matched with a clamping block for use; after a cable is connected, the sealing sleeve is moved to a joint, and the screw blocks are in threaded connection with the sealing sleeve; after connection, the one-way ratchet wheel is rotated clockwise by a tool, and the one-way ratchet wheel drives a rotating block to rotate; therefore, a clamping block extends out under the action of the rotating block, a limiting block and a positioning ring, the clamping block is attached to the cable, and the screw blocks and the cable are fixed together through the clamping block. Meanwhile, as each clamping block is tightly attached, the water and dust can be completely isolated on the outer sides of the screw blocks, the clamping block is made of polyethylene materials, the corros