The invention provides an AP (Access Point) switching method based on double wireless network cards. A mobile terminal actively scans the signal intensity of an AP and then compares the scanned signal intensity with the current AP signal intensity, begins switching when the signal intensity is higher than the current AP signal intensity, otherwise, continues scanning till successful switching. In order to reduce the switching delay, aiming at the characteristic that the mobile path in an industrial application scene is substantially fixed, the invention provides a pre-learning mechanism, namely learning information such as AP position, switching sequence and the like of the application scene before formal application, and storing the information to a terminal node, so as to realize directional scanning and switching in formal application. The method solves the problem of quick AP switching in the industrial mobile network scene; uninterrupted switching is realized by adopting double wireless network cards; and the pre-learning mechanism is adopted for the specific industrial application scene to further reduce the scan delay.