The invention aims to provide a box for collecting and crushing water lettuce, which is used for collecting and crushing extracted water lettuce, thus reducing the impact on the environment. The box comprises a funnel-shaped box body, the top of the box body is provided with a feeding port. The center of the box body is provided with a vertical rotating shaft through a support and a driving mechanism for driving the rotating shaft to rotate. The rotating shaft is fixedly connected with several blades, and the blades are tilted to form a propeller structure. The driving mechanism is higher thanthe feeding port; the box body is provided with a filter net, under the blades, and a slag discharge port is arranged under the filter net, and a slag discharge door which can be opened and closed isarranged at the slag discharge port; the distance between the blades and the filter net is 5-10 cm. The box has the advantages of simple structure and low cost, the box can crush and collect the water lettuce, and the space occupied by the follow-up treatment of the water lettuce is reduced, and the box has good practicability.