The embodiment of the invention provides a network function virtualization composer realization method and device, and relates to the communication technology field. The objective of the invention is to realize the NFVO with high availability. The method comprises: a front module receives business request information carrying business session parameters, and issues the corresponding business request information to a business processing module according to the business session parameters; the business processing module processes business according to the business request information sent by the front module to generate and return back the business request response information to the front module; and a storage module provides data required by business processing according to the business request information to the business processing module, receives the update data being subjected to business processing by the business processing module according to the business request information and stores the update data. The network function virtualization composer realization method and device are applied to the NFV system structure.