The present disclosure relates to a terminal water-entry protection method and an electronic device. The method includes: arranging at least one start region in a touch region of a touch screen of a terminal, where at least one node is included in the start region; acquiring a trigger value of each node in the at least one start region, and acquiring a marker value of each node in the whole touch screen if the trigger value of at least one node in the at least one start region reaches a predetermined trigger threshold; increasing the number of nodes in a water-entry region by one when the marker value of any node in the whole touch screen reaches a predetermined marker threshold; judging whether the number of nodes in the water-entry region reaches a predetermined value; and controlling a power source of the terminal according to a judgment result.