A carbonization furnace door for bottom charging and discharging comprises a furnace door, a furnace door frame and a sand sealing frame, wherein the furnace door adopts the structure that furnace door bricks are built on a furnace door base plate, a connector connected with a furnace door push rod is arranged at the lower center of the furnace door base plate, and sealing plates matched with the furnace door frame are fixed at the periphery of the furnace door base plate; the furnace door is arranged in the furnace door frame and is fixed by a self-locking device; the furnace door frame is fixed on a base plate of a carbonization furnace and extends downwards to be matched with the sealing plate and form a sealing port of the carbonization furnace; and the furnace door frame is inserted into the sand sealing frame so as to realize the sealing of a carbonization chamber. The carbonization furnace door for bottom charging and discharging has the advantages that the dual functions of sealing the carbonization chamber and replacing the base plate of the carbonization chamber of the carbonization furnace are achieved, and the problem of the leakage of the carbonization furnace door can be effectively solved.