The present disclosure provides a height measurement method based on monocular machine vision. The method includes: picking up, by an RGB camera arranged on the head of a robot, a two-dimensional identifier from the head to feet of a person under measurement； calculating, by the robot, a homography matrix of a current visual field according to four corner points on the visual location identifier； acquiring a head image region by segmenting the image, and calculating pixel coordinates of a head vertex； and calculating a height of the person under measurement. The height measurement method based on monocular machine vision according to the present disclosure is simple in operation and calculation. The height of a person under measurement may be measured by himself or herself with no assistance from others. The measurement method features non-contact. The method further improves the measurement precision, and enhances the measurement speed.
