The invention discloses a method of implementing updating of a web cache through a broadcast network. The method comprises the following steps that a user handheld device visits user side gateway equipment with data cache capacity through a network link, when cache data is searched, a user request is immediately answered; when the cache data is not searched, network service is completed through requesting an operator network; the operator network is provided with a unified content gateway server, through a user access content, a data cache is stored in a data cache server as a file, after multiple users request for many times, hot content data is determined through algorithms, such as statistical analysis, of a strategy management server, and the hot content data is transmitted to the user side access gateway equipment through the broadcast network, so that updating of the network data cache is implemented. In comparison with the prior art, the network cache data of the user side access gateway equipment is updated according to a principle that hot spot data is transmitted at one point and is received at multiple points through the broadcast network according to the strategy algorithms, such as the request times and the probability, so that the request for the operator network by a user is reduced, and the method of improving the network access rate and the network response speed is achieved.