Preparation device capable of controlling material quantity

The preparation device comprises a transparent box, a base and a conical block, the transparent box is located above the base, two supporting plates are symmetrically and fixedly connected between the transparent box and the base, first feeding ports are formed in the upper ends of a left side plate and a right side plate of the transparent box respectively, a guide plate is fixedly connected into the transparent box, and the conical block is fixedly connected with the guide plate. A guide plate is arranged in the transparent box, a conical block is arranged in the guide plate, a discharge port is formed in the guide plate, the conical block is located on the discharge port, a height adjusting mechanism is arranged on the transparent box, a sliding plate is slidably mounted in the transparent box, sealing strips are arranged on the periphery of the sliding plate, and a discharge pipe communicates with the sliding plate. The feeding speed is controlled under the action of a guide plate, then a stirring mechani