The invention relates to an automatic cropping and tray arranging device. The automatic cropping and tray arranging device comprises a rack, a cropping mechanism, a rotary material receiving mechanism, a first carrying mechanism, a rotary material putting mechanism, an empty tray and full tray storage mechanism and a second carrying mechanism. The rotary material receiving mechanism receives materials from the cropping mechanism. The first carrying mechanism takes materials from the rotary material receiving mechanism and puts the materials into empty material trays of the rotary material putting mechanism. Changing of the empty material trays and full material trays is achieved through the second carrying mechanism. By means of the automatic cropping and tray arranging device, continuousoperation of cropping and tray arranging can be achieved, a manner of manual tray arranging after cropping is not adopted, the manual interference is reduced, then, negative phenomena of scratching, oil contamination and the like are reduced for products, and the yield of the products is increased. Meanwhile, the automatic cropping and tray arranging device is used for carrying out cropping and tray arranging operation, the efficiency is relatively high, and the production time is saved. In addition, a rubber coating detection unit and a rubber opening pressurizing unit are integrated in the automatic cropping and tray arranging device, the space utilization rate is increased, the cost is reduced, and the integration level is higher.