The invention discloses a method for testing the repeated positioning accuracy of a machine. Four target points with typical features are found in a working area. Then, followed are four steps: Step 1, respectively fixing two dial indicators on X-stroke and Y-stroke guide rails at one target point, so as to measure the precision numerical value of X-axis and Y-axis strokes; Step 2, making fine adjustment of points of the dial indicators in the X and Y rectangular coordinate system, and regulating the indication numerical value; Step 3, randomly finding four different starting points near each target point, and testing the repeated positioning accuracy from each starting point to the target point; and Step 4, repeating the steps 1-3 and testing the other three target points. In this way, bottlenecks that the repeated positioning accuracy cannot be measured after installation of mechanical structures are fixed, and theoretical basis is provided for calculation of electrical parameters of products by means of feedback of measurement results of the repeated positioning accuracy of mechanical structures.