The invention belongs to the technical field of luggage equipment, and particularly relates to an anti-shake
locking mechanism of a telescopic draw bar of a draw-bar box, which comprises a fixed rod and a telescopic rod, the telescopic rod is movably connected with the fixed rod in the length direction, so that the telescopic rod can be switched between a contraction
station and an extension
station; the device further comprises a clamping block, and the clamping block is movably arranged relative to the fixing rod in at least the radial direction of the fixing rod so that the clamping block can be switched between a locking
station and an unlocking station. A first linkage mechanism is arranged between the clamping block and the telescopic rod, and when the telescopic rod is switched to the stretching station from the contraction station, the clamping block can be driven to be switched to the locking station from the unlocking station. The
structural rigidity and use stability of the pull rod in the stretching state are remarkably improved while original stretching smoothness is maintained, additional operation of a user is not needed in the whole process, the shaking defect of a traditional pull rod is overcome, and use convenience is kept.