A height adjusting device for a vehicle suspension seat, comprising: a control valve having an air injection pin and an air discharge pin formed therein; a first push support having one end rotatably coupled to the control valve and pressurizing the air injection pin when rotated in a first direction; a second push support having one end rotatably coupled to the control valve, pressurizing the air discharge pin when rotated in a second direction, and disposed to correspond to the first push support; a first push rod pressurizing the other end of the first push support so as to rotate the first push support; and a second push rod pressurizing the other end of the second push support so as to rotate the second push support, and disposed to correspond to the first push rod, characterized in that the first push support is formed in U-shape, one end of which is rotatably coupled to the control valve such that an inner surface of the first push support is contacted with the air injection pin, and the other end of which is bent so as to form a first pressurization portion disposed adjacent to a first pressurization protrusion of the first push rod, and wherein the second push support is formed in U-shape, one end of which is rotatably coupled to the control valve such that an inner surface of the second push support is contacted with the air discharge pin, and the other end of which is bent so as to form a second pressurization portion disposed adjacent to a second pressurization protrusion of the second push rod, the height adjusting device further comprises an arm rod rotated by an operation of a height adjusting lever, and an arm rod spring coupled to a rotating shaft of the arm rod and elastically supporting the first and second push rods (120, 130) with respect to the rotation direction, and the first and second push rods (120, 130) are coupled to the rotating shaft of the arm rod and rotated together when the arm rod is rotated. a control valve having an air injection pin and an air discharge pin formed therein; a first push support having one end rotatably coupled to the control valve and pressurizing the air injection pin when rotated in a first direction; a second push support having one end rotatably coupled to the control valve, pressurizing the air discharge pin when rotated in a second direction, and disposed to correspond to the first push support; a first push rod pressurizing the other end of the first push support so as to rotate the first push support; and a second push rod pressurizing the other end of the second push support so as to rotate the second push support, and disposed to correspond to the first push rod, the first push support is formed in U-shape, one end of which is rotatably coupled to the control valve such that an inner surface of the first push support is contacted with the air injection pin, and the other end of which is bent so as to form a first pressurization portion disposed adjacent to a first pressurization protrusion of the first push rod, and wherein the second push support is formed in U-shape, one end of which is rotatably coupled to the control valve such that an inner surface of the second push support is contacted with the air discharge pin, and the other end of which is bent so as to form a second pressurization portion disposed adjacent to a second pressurization protrusion of the second push rod, the height adjusting device further comprises an arm rod rotated by an operation of a height adjusting lever, and an arm rod spring coupled to a rotating shaft of the arm rod and elastically supporting the first and second push rods (120, 130) with respect to the rotation direction, and the first and second push rods (120, 130) are coupled to the rotating shaft of the arm rod and rotated together when the arm rod is rotated.