The invention discloses a measuring method for inspection robot movement track straightness based on multi-image sequence. The method comprises: placing square positioning identifiers on the same positions of each hydraulic support, using a camera to acquire a hydraulic support image, when an inspection robot walks to the tail end of each section of a scraper blade and the junction of each section of the scraper blade and the hydraulic support, respectively shooting images; performing noise reduction on target images obtained by acquisition, extracting the positioning identifiers in the images which is performed by noise reduction; performing edge line fitting on each positioning identifier, to obtain four vertex coordinates of each positioning identifier; calculating an included angle between adjacent scraper blades, and according to the length of the scraper blade and the included angle between adjacent scraper blades, fitting a movement track of the inspection robot, and measuring straightness of the movement track. A non-contact vision measurement technology is used to measure movement track straightness of the inspection robot of a working face, and accuracy is high, and the method provides necessary technical support for control of the working face and safe operation.