1. A microscopic vision measurement method based on adaptive positioning of a camera coordinate frame, comprising: Step A: acquiring pairs of synchronical images and transmitting the acquired images to a computer through an image acquisition card; Step B: calculating 3D coordinates of feature points in a scene according to the matched pairs of feature points in the scene obtained from the synchronical images and the calibrated parameters of a microscopic stereo vision measurement model; and Step C: performing specific measurement according to the 3D coordinates of the feature points in the scene.