The invention discloses a method and device for achieving network type switching. The method comprises the following steps of determining whether the current position of a terminal device belongs to a preset type stability region or not; detecting and determining the connectable network type with the highest signal strength of the terminal device; switching the terminal device to a network of the network type with the highest signal strength, and after switching is completed, performing configuration that switching of the network type is forbidden before the terminal device does not leave the type stability region, wherein the type stability region comprises regions where the signal strength of the high priority network type is lower than the signal strength of the low priority network type. According to the method and device, switching of the network type is performed by setting the type stability region, reasonable network type selection is performed by the terminal device, the terminal device obtains the network type with the high signal strength, power consumption caused by the ping-pong reselection effect is avoided, and the called call drop rate caused by cell reselection is decreased.