The invention discloses a fusion device, a system and a method for realizing IPTV (Internet protocol television) service. The fusion device is integrated with a CDN (content distribution network) component and a network component, wherein the CDN component is used for receiving a media service request sent by an STB (set-top box), for looking up a service strategy template matched with a service type carried by the media service request in a service strategy template database, for sending a network support request to the network component, and for supplying service to the STB by using the inquired service strategy template after a successful response message fed back by the network component is received; and the network component is used for looking up a network strategy template matched with a service strategy in network strategy template database after the network support request is received, for executing the inquired network strategy template, feeding back the successful response message after successful execution, and for providing a network resource support for the CDN component by using the network strategy template. The fusion device fuses a content distribution function and a network service function, so that the quality of the IPTV service is effectively ensured.