The invention provides an ejector seat vector device that is composed of an ejector seat, a rocket pack device, a spring claw mechanism, a support, a steel cable, a guide wheel, a control mechanism and the like. One end of the rocket pack device (2) is connected with a chair basin of the ejector seat (1) through a hinge; the other end of the rocket pack device (2) is connected with the spring clawmechanism (3) through a hinge; the support (5) is connected to the chair basin of the ejector seat (1) through a hinge, the guide wheel (6) and the control mechanism (7) are fixed in an aircraft cabin, a steel ball (4a) of the steel cable (4) is clamped in the spring claw mechanism (3), and a steel ball (4b) of the steel cable (4) is arranged in an opened spring claw (7a). Under the abnormal condition of the ejector seat, the rocket pack thrust angle can be automatically changed before the ejector seat is ejected out of the aircraft cabin, so the ejector seat can generate upward thrust, the ejection lifesaving performance of the seat is improved, and successful implementation of ejection lifesaving is guaranteed.