The steam self-circulation device can allow steam to be automatically cooled and return to a pot, and belongs to the technical field of
traditional Chinese medicine decocting machines. The conventional steam self-circulation decocting machines in markets use pipes to allow steam to be cooled and liquefied and return to the pot through external coolers, and a product is needed to overcome the defect. The steam self-circulation device includes a pot cover casing, a pot cover
handle, a pressure-limiting valve, a fan, an air inlet, a
copper cooling fin, upper air outlets, lower air outlets, a condenser
pipe, a lock catch, a pot cover connection unit, a sealing ring, a pot body fixing unit, a pot body, and an air duct. During use, the pot cover casing can be fastened and sealed through the lock catch and the pot body fixing device and forms a
whole body with the pot body, the fan is opened, air on the upper end of the air duct is discharged out of the upper air outlets through the
copper cooling fin, air on the lower end of the air duct is discharged out of the lower air outlets through the condenser
pipe; rapid air circulation can take heat away, the bottom of the pot cover casing contacts a steam surface and the condenser
pipe to be cooled, and then steam is cooled and liquefied and automatically returns to the pot.