The invention discloses a network load balancing vertical switching method considering user QoS. The method includes the following steps of firstly, dividing all users into two groups according to whether network switching is needed or not, when the requirement of the user can not be met by the current network because of the movement or the network state change, putting the user in the switching group, and when the connecting state in the original network is good and the switching does not need to be executed for the user, putting the user in the keeping group; secondly, calculating the loads of the users needing switching in the switching group on a base station and an access point through a distribution matrix, and selecting a network capable of balancing the load utilization rates of all the networks according to an optimal load balancing algorithm; thirdly, weighting all the networks by means of a layered analysis method according to the user requirements. The resource utilization rate is increased, the user QoS requirements are met by weighting all the networks by means of the layered analysis method, and the method is aimed at a universal wireless network and can also be used in an electrical wireless private network.