Automatically network switching method and device for set top box

The embodiment of the invention provides an automatically network switching method and device for a set top box. The method includes the steps that 1 a network state of a first network of the set top box is detected in real time, if the connection break of the first network is physical break and the network breaking is not operated by a user, the first network state is obtained by detecting; 2 the first network state is received, waiting time is set, after the waiting time passes, the connection of the first network still does not recover, a second network is opened automatically and a connection is tried, if the second network is unsuccessful to connect, the first network is switched back. The method has the advantages that the automatic switching of a wire network and a wireless network can be achieved without human intervention, and a good usage experience is provided for the user.