Multi-stage internal circulation biomass fuel preparation dryer

The utility model discloses a multi-stage internal circulation biomass fuel preparation dryer, and particularly relates to the technical field of biomass fuel preparation, the multi-stage internal circulation biomass fuel preparation dryer comprises a roller drying bin, the exteriors of the two ends of the roller drying bin are connected with supporting frames, the bottoms of the two supporting frames are provided with supporting seats, the bottoms of the supporting seats are connected with a bottom plate, and the bottom plate is connected with the roller drying bin. A port is formed in one end of the roller drying bin, a feeding hopper is arranged at the position, close to the upper portion of the port, of one side of the roller drying bin, a conveying pipe is arranged at the bottom of the feeding hopper, and an adjusting mechanism is installed on one side of the bottom of the feeding hopper. During use, lifting and left-right movement of the feeding hopper and the conveying pipe are conveniently adjusted, f