A center console armrest assembly for a vehicle may include an armrest allowing an upper portion of a center console to be open, an armrest core configured to rotate about a main hinge positioned in the center console, together with the armrest, and a fixed lever fixed into the center console, the main hinge being positioned at the fixed lever, wherein the armrest slides along the armrest core to be inserted into the center console in a state in which the armrest is opened.