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Geometric similarity method is subordinate to monocular vision measurement method, Monocular vision measurement method has simple structure, fast calculation speed, good stability and so on, more and more used in the field of computer vision measurement. According to the measurement principle of geometric similarity method, a monocular vision optical velocity measurement method based on geometric similarity method is proposed, mainly used for initial velocity measurement of high-speed projectile targets, compared with radar, laser and other speed measurement methods, it has visual advantages. The target’s state details are visible during flight, and it is faster and more stable than other monocular vision measurement methods, and the layout is simple. After experimental verification, the results show that using this method to measure speed, the target initial velocity can be given effectively, the speed measurement error is within 1%. The feasibility of measuring the initial velocity of projectile high-speed target by using single-camera is verified.