The invention provides an anti-seizure deformity correction external fixator. The fixator has 6 degrees of freedom and mainly consists of a proximal ring, a distal ring, 6 length adjustable branches,an adjustment knob, a sliding self-locking needle clip, T-ring grooves and a kirschner wire. The deformed bone is fixed on a fixing ring of the fixator by the kirschner wire, the T-ring grooves are formed in the proximal ring and the distal ring, and the self-locking needle clip can slide in the grooves. The posture of a moving platform can be changed by adjusting the length of a branch chain andlocking some moving pairs to achieve correction of three-dimensional deformity such as angle, misalignment, rotation or separation. Three ball joints on each branch chain can achieve separate locking,can effectively solve the problems of interference and seizure during the correction process, and achieve correction of all rotation and displacement deformities. The sliding self-locking needle clipcan effectively prevent complications like needle infection, a frame and a support rod are not required to be changed in the correction process, the fixing is reliable, and the fixator is convenientto use.