The invention relates to a high-temperature gradient directional solidification conical graphite induction heater which comprises a conical high-frequency induction coil (7) and a conical heating body(1). A straight cylinder is arranged at the small diameter end of the heating body (1), and the small diameter end of the heating body (1) is arranged on a radiation baffle (3); one end of a crucible(6) penetrates through a middle hole of the radiation baffle (3) to be connected with a pulling system (9), and the other end is arranged in the heating body (1); and the high-frequency induction coil (7) is sleeved outside the heating body (1) to be connected with a high-frequency induction power supply (10). The high-temperature gradient directional solidification conical graphite induction heater uses the small diameter end of the heating body to intensively and emphatically heat a melting interface of a sample and limits overheating within a small area at the front edge of the interface so as to prevent the corundum crucible in the directional solidification process from being damaged due to durable overheating, shorten the distance between the highest temperature area and the solidifying interface and improve the temperature grads of the front edge of the solid/liquid interface, thereby improving the material texture and the comprehensive performance of the material and being suitable for large-size directional solidification samples.