The invention provides a user service request selection method based on an end-to-end network slice, and belongs to the field of communication technology. A user sends a new service request to a server via a wireless access point; after receiving the request, the server forwards the user service request to an SDN controller, and asks the SDN controller to authenticate and authorize the user; if the user fails to pass authentication and authorization, the server sends a failure response of the new service request to the user; and if the user passes authentication and authorization, the server selects a proper network slice ID for the user and carries out coupling, establishment of a data transmission link among the access network, the SDN controller and an S/P-GW gateway is notified, the server sends a success response of the new service request to the user, and concrete content of the user request is returned. According to the invention, part of network functions is shared between different network slices, and the resource utilization rate is improved.