A backhaul bandwidth management method for a wireless network, characterized in that the backhaul bandwidth management method comprises: adjusting a backhaul connection mode by a repeater (120_1) in a backhaul network according to a wireless capability; determining whether a value of received signal strength indicator, RSSI, is greater than a threshold value when the repeater (120_1) determines that a selected access point, AP, supports IEEE 802.1lax standard; when the repeater (120_1) determines that the RSSI is greater than the threshold value, determining whether one of 5G RF bands supports IEEE 802.11ac standard only when the repeater (120_1) is a tri-band repeater; when the repeater (120_1) is a tri-band repeater and one of the 5G RF bands supports the IEEE 802.11ac standard only, a backhaul SSID is set to a IEEE 802.11ac standard only mode; when the RSSI received by the repeater (120_1) is less than the threshold value and the repeater (120_1) is a tri-band repeater, the backhaul SSID is set to an RF band supporting a IEEE 802.11ax standard, and a front haul SSID is set to another RF band; when the RSSI received by the repeater (120_1) is less than the threshold value and the repeater (120_1) is a dual-band repeater, the backhaul SSID is set to the IEEE 802.11ax standard only mode; guaranteeing a backhaul guaranteed bandwidth by the network device according to at least one of a dedicated service set identifier, SSID, a dedicated radio frequency, RF, band and a dedicated wireless mode; executing a bandwidth allocation algorithm by the network device to ensure that at least one backhaul transmission connection has the backhaul guaranteed bandwidth; wherein the step of executing the bandwidth allocation algorithm by the network device to ensure that the at least one backhaul transmission connection has the backhaul guaranteed bandwidth comprises: executing an airtime fairness algorithm to ensure that at least one backhaul transmission connection has the backhaul guaranteed bandwidth. adjusting a backhaul connection mode by a repeater (120_1) in a backhaul network according to a wireless capability; determining whether a value of received signal strength indicator, RSSI, is greater than a threshold value when the repeater (120_1) determines that a selected access point, AP, supports IEEE 802.1lax standard; when the repeater (120_1) determines that the RSSI is greater than the threshold value, determining whether one of 5G RF bands supports IEEE 802.11ac standard only when the repeater (120_1) is a tri-band repeater; when the repeater (120_1) is a tri-band repeater and one of the 5G RF bands supports the IEEE 802.11ac standard only, a backhaul SSID is set to a IEEE 802.11ac standard only mode; when the RSSI received by the repeater (120_1) is less than the threshold value and the repeater (120_1) is a tri-band repeater, the backhaul SSID is set to an RF band supporting a IEEE 802.11ax standard, and a front haul SSID is set to another RF band; when the RSSI received by the repeater (120_1) is less than the threshold value and the repeater (120_1) is a dual-band repeater, the backhaul SSID is set to the IEEE 802.11ax standard only mode; guaranteeing a backhaul guaranteed bandwidth by the network device according to at least one of a dedicated service set identifier, SSID, a dedicated radio frequency, RF, band and a dedicated wireless mode; executing a bandwidth allocation algorithm by the network device to ensure that at least one backhaul transmission connection has the backhaul guaranteed bandwidth; wherein the step of executing the bandwidth allocation algorithm by the network device to ensure that the at least one backhaul transmission connection has the backhaul guaranteed bandwidth comprises: executing an airtime fairness algorithm to ensure that at least one backhaul transmission connection has the backhaul guaranteed bandwidth.