The embodiment of the invention provides a service quality analysis method, a service quality analysis device and a network system, relates to the technical field of communication, and solves the problem that in the prior art, when the service quality of a user is tested by using a dial testing method, the service quality for each user using a broadband service in a test area is difficult to accurately calculate out. The method comprises the following steps: acquiring real-time application data of a user; acquiring a flow server log and a network flow (NETFLOW) log in the real-time applicationdata; and determining the average flow of applications used by the user according to the flow server log and the NETFLOW log, wherein the types of the applications comprise a webpage, a game and a video; and determining a service quality analysis result of the user according to the average flow. The embodiments of the invention are used for analyzing the service quality when the user uses the broadband service.