Underground storage bin for casting coating production

The utility model discloses an underground storage bin for casting coating production. The underground storage bin comprises a rectangular storage box, supporting legs are arranged on the outer side face of the rectangular material storage box, a conical flow guide groove is formed in the lower end face of the rectangular material storage box, a discharging nozzle is arranged on the lower end face of the conical flow guide groove, a discharging motor is arranged on the outer side faces of the supporting legs, and an output shaft of the discharging motor is connected with a rotating shaft. Accumulation of materials can be avoided, moist gas in the storage bin can be exhausted by heating air in the storage bin and the materials, and the materials can be effectively prevented from caking in the storage bin; materials entering the bin can be evenly discharged to all corners in the bin through the combination of the first V-shaped flow guide plate and the second V-shaped flow guide plate, the position of the hollo