The invention provides a limiting device. The limiting device comprises a running water frame, a limiting mechanism arranged on the running water frame, and a support mechanism connected to the running water frame; as the running water frame is movably provided with multiple round rods arranged in parallel, when parts to be inspected pass through the multiple round rods in sequence, the parts to be inspected can slide from one end of the running water frame to the other end; as a locking block is provided with a groove matched with the limiting plate, when a pushing block is pulled, the limiting plate can be hinged to the multiple locking blocks; the support mechanism includes a support frame connected to the running water frame, and a chute formed in the support frame; and the chute is connected to the position, near the limiting plate, of the running water frame, so that the limiting plate can slide onto the support frame along the chute. The limiting device can prevent a breaker from falling onto the ground to be damaged in the moving process, and importantly, prevents injury of the safety of inspectors.