The utility model provides a needle collision preventing mechanism of a binder, which belongs to the technical field of sewing machines and solves the problem that needles are easy to fracture during use of an existing binder. The needle collision preventing mechanism is arranged between the binder and a body of a pocket welting machine and comprises a first limiter and a second limiter which are arranged on the binder and the pocket welting machine respectively, the first limiter and the second limiter are opposite to each other, a transversely relative position between the binder and the body of the pocket welting machine can be blocked when the binder is pressed downwards, and when the binder is lifted, the locking of the transverse relative position between the binder and the pocket welting machine can be released. The needle collision preventing mechanism of the binder can move between two needles when the binder is pressed downwards, and transversely relative position between the binder and the pocket welting machine is locked, so that the binder cannot move laterally and the needles are protected.