Freeze-drying disc of freeze dryer

The freeze-drying disc comprises a freeze-drying machine body and a plurality of freeze-drying disc bodies, a freeze-drying box is fixedly connected to the top of the freeze-drying machine body, and a plurality of sets of first sliding grooves and second sliding grooves are symmetrically formed in the inner side wall of the freeze-drying box. First sliding columns and second sliding columns are fixedly connected to the two sides of the surfaces of the multiple freeze-drying disc bodies. According to the freeze-drying tray, the first sliding column, the second sliding column, the first sliding groove, the second sliding groove and the like are arranged, the first sliding column and the second sliding column on the freeze-drying tray body slide in the second sliding groove, the first sliding groove and the third sliding groove respectively, and a freeze-drying sample is prevented from being stuck to the freeze-drying tray body through a scraper; according to the freeze-drying tray, the freeze-drying tray body c