The invention discloses a regressing heading machine. The regressing heading machine comprises an anterior shield, a cutter edge block and a host core, wherein the host core can move to the directionswhich is close to and away from the anterior shield and the cutter edge block, the host core comprises a main driving part which is removably connected with the anterior shield, a cutter central block which is connected with the main driving part and is removably connected with the cutter edge block and a screw conveyor which is arranged on the inner ring of the main driving part, and one end, which is close to the cutter central block, of the screw conveyor is lower than the rotary center of the main driving part. The invention further discloses a regressing method of the regressing headingmachine. According to the regressing heading machine, the regressing of the host core can be realized, so that the condition that the heading machine is disassembled into small components is avoided,the manpower and time cost of caved disassembly is reduced, the equipment transfer efficiency is improved, and the technical problem that an existing heading machine cannot meet the construction requirement in complex geologic conditions and application occasions is solved.