The embodiment of the invention discloses a network access method and device. The method comprises the following steps of acquiring a network access scheme and using the network access scheme to carryout network access; acquiring current network connection state data when the network access which is performed through adopting the network access scheme fails; and based on the current network connection state data, carrying out network diagnosis so as to adjust the network access scheme, and carrying out network access again or ending the network access. In the embodiment of the invention, thecurrent network connection state data is combined to output an optimum network connection scheme, and network connection is performed based on the scheme. The safety, the validity and the high efficiency of the network access are increased.