Seat elevation control apparatus for vehicle

A seat elevation control apparatus for a vehicle includes a switch configured to control a relief valve that includes a body, one surface of which has a hook latch at one end thereof, and the other surface of which has a spring connection port, an exhaust port, and a pump connection port protruding therefrom. The switch further includes a button hinged to the other end of one surface of the body and having a hook corresponding to a shape of the hook latch. When the button is pressed down, the hook and the hook latch are coupled to press down on the plunger, and the compressed air in the air spring is exhausted. When the button is pressed down again, the hook and the hook latch are decoupled to return the plunger to its original position, and the compressed air in the air spring is not exhausted.