A backhaul bandwidth adjusting method includes: acquiring the amount of the data to be transmitted of each access device in a first time window, the access device including access user equipment and a wireless backhaul base station; and determining, on the basis of the amount of the data to be transmitted of each access device in the first time window and a wired backhaul bandwidth, an available backhaul bandwidth allocated for each wireless backhaul base station in the next first time window. As such, a wired backhaul base station can allocate to a wireless backhaul base station reasonable bandwidths of an uplink backhaul link and a downlink backhaul link on the basis of the amount of the data to be transmitted of the connected wireless backhaul base station, such that spectrum resources can be used more effectively.