Abstract: At present, machine vision technology is widely used in the field of impact point coordinate measurement. In order to solve the problem of binocular vision technology calibration and complex calculation, a method of impact point measurement based on monocular vision technology was proposed. The four corner points of the target surface and the pixel coordinates of the impact point was located through image processing technology, the rectangular P4P method was used to calculate the posture of the target surface coordinates relative to the camera coordinate system, and the actual coordinates of the impact point on the target surface was calculated according to the principle of monocular vision imaging. According to this method, the coordinates of target bullet hole in the experiment were successfully measured, and the maximum test error was 2.3 mm. The results show that the method can quickly and accurately measure the position and attitude relationship between the target surface and the camera and the coordinates of the impact point.