Network switching method and device and mobile terminal

The embodiment of the invention discloses a network switching method which comprises the following steps: when a mobile terminal is in a first network connection state, if a target event needing to be executed under a second network is detected, a first cell list under a first network is acquired, the first cell list comprises a target first cell, and when a historical target event is triggered, the first cell list comprises the target first cell; the target first cell is connected with the mobile terminal, and the base station does not send a connection release instruction with the target first cell to the mobile terminal; determining whether a current first cell currently connected with the mobile terminal belongs to the target first cell; if yes, connection with the current first cell is disconnected, a second cell reselection list of a second network is obtained, the second cell reselection list comprises a target second cell, and when a historical target event is triggered, the mobile terminal reselects