Positioning method of precision displacement platform

The invention discloses a positioning method of a precise displacement platform, and the method comprises the following steps: obtaining a plurality of calibration plate images in a process that the displacement platform moves from an initial position to a preset position; processing the calibration plate image by using a machine vision method, and obtaining an ordered array of image coordinates of each dot on the calibration plate image; establishing a world coordinate system on the calibration plate image by taking any point in the calibration plate image as an original point to obtain an ordered array of world coordinates of each dot on the calibration plate image; camera calibration is carried out by using the ordered array and the ordered array, and a conversion relation between a camera coordinate system and a world coordinate system is established; and calculating the distance between the starting position and the ending position of each round point on the calibration plate under a world coordinate sys