A portable electronic device includes a host module, a display module pivoted to the host module, a pivoting component and a lifting mechanism. The pivoting component is driven by the display module to rotate simultaneously. The lifting mechanism includes a base, a linking component connected to the base, a sliding component and a pushing component. A guiding slot is formed on the sliding component, and the guiding slot sheathes the linking component. The pushing component is installed on the pivoting component for pushing the sliding component to move in a first direction after the display module pivots relative to the host module to a predetermined angle, so that the guiding slot guides the linking component to move in a second direction different from the first direction, so as to drive the base to protrude outside a bottom side of the host module to lift the host module up.