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This paper mainly expounds the basic knowledge of IPTV network service, multicast protocol, QoS protocol and OPNET Network simulation software, and expounds the development status of IPTV network in the service bearer network, studies the shortcomings of IPTV network transmission congestion that may occur, and proposes an IPTV bearer network networking scheme based on multicast and QoS Technology. This paper focuses on the model level and construction mode of OPNET, and puts forward the specific steps of OPNET Network simulation. The simulation experiment is carried out by OPNET software. In the simulation, according to the three types of data service, IP voice service and IPTV service, the network transmission quantity, terminal received data flow, network delay value and network jitter value are tested and simulated respectively, and the collected network state information is analyzed. Through the simulation experiment, it can be found that using QoS and multicast in IPTV network can effectively reduce the traffic load of the service network, reduce the transmission delay, improve the stability of the network system, and ensure the smooth progress of relevant services.