The invention provides a detection jig for detecting the yield strength of a ball coupling. The ball coupling comprises a ball joint connecting rode and a holding body connected with the ball joint connecting rod, the detection jig comprises first jigs and a second jig, the first end of each of the first jigs is connected with the ball coupling, and the second end of each of the first jigs is provided with a first connecting portion for connected with a pull device; and the first end of the second jig is connected with the ball coupling. Two types of jigs are arranged, and the two types of jigs are fixed through screw threads or bolts, and are connected with the ball joint and a test device, so the effective fixation of the ball joint is realized, and a problem that clamping cannot be realized by common jigs is solved.