A network element access method, comprising the following steps: receiving, by a network element that has accessed a network, an access data request sent by a network element attempting to access the network, wherein the network element that has accessed a network has valid link data and has the capability of performing data transmission with the network by using a network resource; the access data request is used by the network element attempting to access the network to request to access the network; sending the access data request to a network management element; receiving an access data response sent by the network management element, wherein the access data response is generated by the network management element by performing authentication according to the access data request; and sending the access data response to the network element attempting to access the network, the access data response indicates whether the network element attempting to access the network is allowed to access the network or not; and wherein before the step of the receiving an access data request sent by a network element attempting to access the network, the method further comprises: receiving link switch configuration information sent by the network management element; receiving an access link establishment request sent by the network element attempting to access the network; and if the link switch configuration information is "enabled", allowing the network element attempting to access the network to perform access link establishment with the network element that has accessed the network according to the access link establishment request; and if the link switch configuration information is "disabled", forbidding the network element attempting to access the network to perform access link establishment with the network element that has accessed the network. receiving, by a network element that has accessed a network, an access data request sent by a network element attempting to access the network, wherein the network element that has accessed a network has valid link data and has the capability of performing data transmission with the network by using a network resource; the access data request is used by the network element attempting to access the network to request to access the network; sending the access data request to a network management element; receiving an access data response sent by the network management element, wherein the access data response is generated by the network management element by performing authentication according to the access data request; and sending the access data response to the network element attempting to access the network, the access data response indicates whether the network element attempting to access the network is allowed to access the network or not; and wherein before the step of the receiving an access data request sent by a network element attempting to access the network, the method further comprises: receiving link switch configuration information sent by the network management element; receiving an access link establishment request sent by the network element attempting to access the network; and if the link switch configuration information is "enabled", allowing the network element attempting to access the network to perform access link establishment with the network element that has accessed the network according to the access link establishment request; and if the link switch configuration information is "disabled", forbidding the network element attempting to access the network to perform access link establishment with the network element that has accessed the network. receiving link switch configuration information sent by the network management element; receiving an access link establishment request sent by the network element attempting to access the network; and if the link switch configuration information is "enabled", allowing the network element attempting to access the network to perform access link establishment with the network element that has accessed the network according to the access link establishment request; and if the link switch configuration information is "disabled", forbidding the network element attempting to access the network to perform access link establishment with the network element that has accessed the network.