Based on the research of machine vision positioning application in recent years, this paper discusses the common machine vision positioning system and its principle, and designs a visual target positioning device to detect people's target intention. It mainly includes dynamic following and target positioning functions. Dynamic following can determine the fixation direction of the tester, and target positioning can obtain the spatial position information of the fixation target. The device can recognize the intention of people by observing the visual fixation direction of the subject and obtain the spatial position information of the target, which is a human-computer interaction path with a widely used scene.