The invention discloses a key disk, comprising key insertion holes and a key ring; key holes are punched along the periphery of the key disk; the key ring penetrates through the key holes; label frames with the names of keys are arranged at the positions, over against the key ring, on the disk surface of the key disk. The key disk is made of a flexible material, is light in weight, cannot generate the obstacles such as colliding and clamping during door opening and has the advantages of small size and easiness in preservation.