The utility model discloses an automatically controlled bulk curing barn for precisely baking a biomass. The automatically controlled bulk curing barn comprises a heating chamber and a baking chamber, wherein an upper ventilating passage and a lower ventilating passage are correspondingly arranged at the upper end and the lower end of a wall between the heating chamber and the baking chamber; the heating chamber is communicated with the baking chamber through the upper ventilating passage and the lower ventilating passage; a heating furnace is arranged in the heating chamber; a fan is arranged on the upper part of the heating furnace and is connected to the upper ventilating passage through a fan exhaust outlet; a cold air door for controlling air flow to enter is arranged on the side wall of the heating chamber; a moisture draining passage with a vent is arranged on the bottom of the baking chamber; and a moisture draining window is formed in the tail end of the moisture draining passage outside the baking chamber. The automatically controlled bulk curing barn is characterized by also comprising a controller, an automatic air-intake control system, an automatic feeding device, an automatically controlled humidifying system, an automatically controlled moisture draining system and an automatic tobacco baking state monitoring device. The automatically controlled bulk curing barn can automatically and precisely control the internal environment in the bulk curing barn and has the advantages of good baking effect, high energy source utilization rate, convenience in operation and the like.