This paper studies the flow characteristics inside the low-temperature carbonization furnace(LTF) including sealing chamber with labyrinth. The flow behavior inside the furnace was analyzed according to different labyrinth shapes. The effects of labyrinth baffle number, and clearance between upper and lower baffles in the sealing chamber were investigated. The large vortex and recirculation region are generated in the chamber when the baffles of the upper and lower surfaces in the labyrinth are maintained at regular intervals. As a result, the gas discharge flow rate can be reduced by 60.8% when the flow distance between baffle and baffle in labyrinth is reduced to 25% of the baffle length.