Abstract: Disclosed is a pyrolysis apparatus of a waste material. The pyrolysis apparatus includes a pyrolysis furnace thermally decomposing an introduced waste material by using air, an upper gate installed at an upper portion of the pyrolysis furnace such that the upper gate is open or closed, and closed after the waste material has been introduced; a lower gate installed below the upper gate such that the lower gate is open or closed, a main valve connected with the exhaust pipe and installed in a main pipe communicating with an inner part of the pyrolysis furnace, a sub-valve connected with the exhaust pipe and installed in a sub-pipe communicating with the inner part of the pyrolysis furnace, and a gas purifying unit receiving gas exhausted from the pyrolysis furnace, aerating the gas into water, and purifying the gas through a filter.