The present invention relates to a system and method for realizing dynamic load sharing function of network service access under NFV framework, including several access nodes and several edge nodes, both of which are VNF nodes, and each VNF node is connected with The internal networks of the system are all connected, and the edge node is connected to the external remote user module, and periodically multicasts its own IP address to the access node, and the edge node calculates its IP address based on the received load status of the access node. Load indicators, and select a suitable access node for the external remote user module to access; the access node is connected to each edge node, and is used to periodically unicast the real-time load status of itself through the protocol message to the edge node, and record the IP address of the edge node in the current network. Adopting the invention can avoid realizing load sharing of user access under the NFV architecture through a proprietary load balancer, and can realize dynamic expansion and contraction of VNF resources at the same time.