Embodiments of the present invention relate to the technical field of electronics, and disclose 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 at least one 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. Accordingly, according to the embodiments of the present invention, the power source of the entire terminal may be cut off before entry into water, thereby protecting elements inside the terminal.