A method of producing a sintered silicon carbide using a reaction sintering method, comprising: (1) dissolving and dispersing a silicon carbide powder in a solvent to produce a mixed powder slurry, (2) flowing the resulted mixed powder into a mold and drying it to obtain a green body, (3) temporarily sintering the green body in one of a vacuum atmosphere or inert gas atmosphere at 1200 to 1900.degree. C. to obtain a temporarily sintered first body, (4) impregnating the resulted temporarily sintered first body with a phenol resin as a carbon source, (5) temporarily sintering the resulted carbon source-impregnated temporarily sintered first body in one of a vacuum atmosphere or inert gas atmosphere at 900 to 1400.degree. C. to obtain a temporarily sintered second body, (6) impregnating the resulted temporarily sintered second body with a melted metal silicon by a capillary phenomenon, and reacting free carbon in the above-mentioned temporarily sintered second body with the silicon sucked into the above-mentioned temporarily sintered second body by a capillary phenomenon to obtain a silicon carbide body.