The embodiment of the invention provides a positioning method, a device and a system, and relates to the field of communication, which solves the problem of failure to dynamically manage RRU/RRH (remote radio unit/remote radio head) in the prior art. The method comprises the following steps of when a positioning request of UE (user equipment) activates M paths of radio frequency RRU/RRH, enabling a server in a base band processing pool to process each of M paths of RRU/RRH according to the operation method of the first RRU/RRH; obtaining an identification of the first RRU/RRH; according to the identification of the first RRU/RRH, obtaining an MAC (multi-access computer) address of a first LMU (location measuring unit) and a check code of the first RRU/RRH; according to the MAC address of the first LMU and the check code of the first RRU/RRH, determining position information and measuring information of the first RRU/RRH; processing each of M paths of RRU/RRH according to the operation method of the first RRU/RRH, and according to the position information and measuring information of each path of RRU/RRH, obtaining a relation matrix of the position information and measuring information of the UE; according to the relation matrix of the position information and measuring information of the UE, locating the UE.