Single-fan two-way circulation drying equipment

A main body of the single-fan two-way circulation drying equipment is a curing barn, and the curing barn is divided into a heating chamber and a baking chamber through a partition plate. The heating chamber is divided into an upper heating chamber and a lower heating chamber through a heat exchanger, and the heat exchanger is connected with an external heat pump through a pipeline; an upper moisture exhaust door and a lower moisture exhaust door are further arranged on the side wall of the baking chamber; a circulating fan is arranged in the upper heating chamber, and an upper ventilation opening is formed in a partition plate between the upper heating chamber and the baking chamber; an upper air supplementing door is arranged on the side wall of the upper heating chamber; a lower ventilation opening is formed in the partition plate between the lower heating chamber and the baking chamber; a lower air supplementing door is arranged on the side wall of the lower heating chamber; and the circulating fan is a do