A dual sliding portable electronic device (100) includes a main body (20), a sliding body (10) and a dual sliding assembly (30). The main body includes a first key array (231), a second key array (232), and a third key array (233) disposed on a top surface (21). The sliding body includes an upper surface (11), a display (13) disposed on the upper surface, and a bottom surface (12) at an opposite side of the upper surface. The dual sliding assembly slidingly connects the bottom surface of sliding body to the top surface of the main body, and is configured to direct the sliding body to slide along a first direction to reveal both of the second key array and the third key array, and along a second direction perpendicular to the first direction to reveal both of the first key array and the second key array.