A slot-type protection device for a plate-shaped product is disclosed. The device comprises a buffer component for inserting the plate-shaped product. The buffer component comprises a folding card and at least one buffer unit. A plurality of slots used for fixing the plate-shaped product are disposed on the buffer unit. The buffer unit comprises a carrying portion and a connecting portion. The slots are disposed on the carrying portion. Two ends of the connecting portion are a fixed end and a free end. The fixed end is fixed and connected to one end of a bottom of the carrying portion, and the free end cooperates with the other end of the bottom of the carrying portion. A connecting structure is disposed to allow the free end and the carrying portion to connect with each other. The folding card is held between the carrying portion and the connecting portion.