Cable tightening device having anti-theft function

A cable tightening device, comprising:

• a fixed unit;
• a rotation member rotatably mounted on the fixed unit;
• a movable unit mounted on the rotation member and movable relative to the fixed unit to drive the rotation member to rotate relative to the fixed unit in a oneway direction;
• a locking unit mounted between the fixed unit and the movable unit to releasably lock the movable unit onto the fixed unit;
• wherein:
• the fixed unit includes a base member having a side formed with a protruding ear formed with a locking hole;
• the movable unit includes a movable member rotatably mounted on the rotation member and movable relative to the base member of the fixed unit;
• the locking unit includes a lock body mounted on and partially protruded outwardly from the movable member of the movable unit to move with the movable member, a linking bar mounted on the lock body and provided with a locking hook that is releasably locked in the locking hole of the base member when the movable member of the movable unit is rested on the base member of the fixed unit, and a press member movably mounted on the movable member of the movable unit and rested on the linking bar to press the linking bar so as to detach the locking hook of the linking bar from the locking hole of the base member.