A steam sterilization apparatus, comprising:a case forming a main body, a water container arranged in an inner rear portion of the case to store watera liquid chemical container arranged behind the water container to store a liquid chemicala nozzle assembly which is arranged in an inner front portion of the case and which includes a steam nozzle for receiving water from the water container and spraying water to the outside and a liquid chemical nozzle for receiving a liquid chemical from the liquid chemical container and discharging the liquid chemical to the outsidea water supply pipe which interconnects the water container and the steam nozzlea liquid chemical supply pipe which interconnects the liquid chemical container and the liquid chemical nozzlea heater block interposed between the water supply pipe and the steam nozzle to heat and vaporize the water supplied through the water supply pipea pump installed at the water supply pipe to apply pressure to the water in the water container and to supply water to the heater block through the water supply pipe anda control unit which controls the operation of the pump and of the heater block.
