Spontaneous combustion type carbonization furnace makes use of the principle of destructive distillation carbonization, and make firewood stick in carbonization furnace hypoxia thermal decomposition to generate combustible gas, tar and carbon. It adopts a movable steel plate structure, the exhaust pipe of the furnace at the top of turn connection with the tar separator and induced draft fan, with features of a unique structure, the big effective volume, advanced carbonization technology, short carbonization cycle, high output, good environmental conservation, long life etc. advantages.