The invention relates to a regeneration device for an organic binder foundry sand. The device includes a vertical furnace(1) comprising a top feed port(2) and a bottom discharge port(12), and a furnace chamber comprising a bottom burning chamber(10) and a top preheating decomposition chamber(6), wherein an inclined fireproof baffle is arranged in the preheating chamber under the feed port(2) for guiding the sand flow, and the discharge port communicates with the bottom of the baffle. The invention is characterized by low cost, high efficiency, and simplified arrangement.