The invention discloses a well type high-temperature resistance furnace for the heat treatment of a PAN (polyacrylonitrile) based carbon felt. A heating body is placed at a center position in a furnace body; an upper circulation water tank is fixed at the upper surface of an upper heat insulation cover; and a lower circulation water tank is fixed at the lower end of the furnace body. The graphite plates of the heating body and annular graphite connection plates are arranged via the way that every two are connected in parallel and every four are connected in series, and are connected in a triangular shape by three electrodes. A water channel is arranged in the upper circulation water tank and the lower circulation water tank. The housing of the furnace body is an interlayer; and the interlayer space forms a channel of circulation water. With the adoption of the heating body, the temperature difference of a hearth uniform temperature zone ranges from 10 degrees centigrade below zero to 10 degrees centigrade. The circulation water of the cover and the bottom of the furnace body and the furnace body can uniformly and directionally flow, so that the heat radiation of the hearth can be effectively shielded, and the outer wall temperature of the furnace body is not higher than 25 degrees centigrade. With the adoption of the heat insulation layer in the furnace body, the hearth can be effectively heated, so that energy consumption is reduced; and the channel, which is simple in structure and reasonable to arrange, is convenient to maintain and exchange.