The embodiment of the invention provides a positioning method and device based on geographic fingerprints under a millimeter wave channel. The method comprises the following steps: estimating an online information sink location according to a preset location of an information sink to be positioned and a preset offline geographic fingerprint database, and determining the online information sink location, wherein the offline geographic fingerprint database is used to store the geographic fingerprints of access points (APs) in a preset positioning area, the geographic fingerprints of an AP include the signal strength of signals that are sent by the AP and received by each reference point (RP) in the preset positioning area, and a relative angle between each RP and the AP, and the relative angle refers to an included angle between the connecting line from the AP to one RP and the vertical direction; and positioning the location of the information sink to be positioned according to the online information sink location. According to the scheme provided by the embodiment of the invention, the characteristics of the relative angle and the signal strength are comprehensively considered in the millimeter wave channel environment, and thus the accuracy of positioning can be improved.