Mortar preparation device

The utility model relates to a mortar preparation device. The mortar preparation device comprises a raw material bin, a spiral conveyor communicated with the raw material bin and a layered stirrer communicated with the spiral conveyor. The spiral conveyor comprises a shell, a first transmission motor arranged on the outer side of the shell, a first connecting part connected with a transmission shaft of the first transmission motor, a second connecting part rotationally connected with the inner wall of the shell and a conveying screw, and the two ends of the conveying screw are connected with the first connecting part and the second connecting part correspondingly. A replacement opening is formed in the shell, and a cover plate is arranged in the replacement opening; the first connecting part comprises a clamping assembly connected with the conveying screw, the end, away from the conveying screw, of the clamping assembly is connected with a transmission assembly providing power for the clamping assembly, and t