The utility model discloses a cooling and heating type closed circulation heat pump curing barn capable of adjusting the airflow direction, and relates to the field of tobacco leaf modulation, and circulating air in a tobacco loading chamber is used as a heat exchange medium for evaporation (refrigeration) or condensation (heating) by adopting a heat exchanger. Circulating air can be treated to atemperature design state point, the requirements of the process technology are met, meanwhile, the heat recovery effect can be achieved, and the phenomenon that exhausted air pollutes the environmentis avoided. Through airflow direction conversion, switching between an airflow ascending mode and an airflow descending mode of the curing barn can be achieved, and therefore the purpose of balanced control over the curing modulation quality of upper, middle and lower layers of tobacco leaves in the tobacco loading chamber is achieved, and the quality of the cured tobacco leaves is improved.