Spray coating drying device and drying method for producing medicinal film coating premix

The invention relates to the field of tablet production, and discloses a spray coating drying device and drying method for producing a medicinal film coating premixing agent, the spray coating drying device comprises a U-shaped frame, supporting frames and a coating pan body, the supporting frames are connected to the edges of the two sides of the lower inner wall of the U-shaped frame, the coating pan body is fastened between the two supporting frames through bolts, and the coating pan body is connected with the U-shaped frame through bolts. A stirring structure is arranged in the coating pan body, a lifting frame is arranged in the middle of the lower inner wall of the U-shaped frame, a material receiving structure is arranged in the lifting frame, an air heater is installed on the edge of the front side of the upper face of the U-shaped frame, and the air outlet end of the air heater is connected with an air supply pipe; a plurality of air outlet holes are formed in the inner wall of an inner cavity of the