An automatic anthropometer for automatically measuring human height is provided. The automatic anthropometer includes a main post configured to stand vertically to a foot board and have a guiding rail formed integrally with an inner surface in a length direction, a sliding post configured to include a guide wheel that rotates along the guiding rail, and ascend and descend along the length direction of the main post under the guide of the guiding rail to measure height of a user, a head-touch bar configured to be coupled to the sliding post, and a lifting-driving device configured to raise and lower the sliding post.