Card type USB flash memory

The utility model relates to a memory device, in particular to a card form USB flash memory disk. The USB flash memory disk comprises a flash memory disk circuit board provided with an ultra-thin USB plug, and a main body for holding the flash memory disk circuit board provided with the ultra-thin USB plug. The memory device is characterized in that the main body is made up of an upper board and a lower board which are matched with each other; a U-shaped groove is opened on one side of the lower board; a sliding panel body is movably arranged in the U-shaped groove; the flash memory disk circuit board provided with the ultra-thin USB plug is put in the sliding panel body. The memory device has the advantages of ultra-thinness, portability, easiness to print artistic patterns, and convenient use. When in use, the sliding panel body which carries the ultra-thin USB plug extends out only through outwards pulling the sliding panel body through a finger; when not in use, the sliding panel body which carries the ultra-thin USB plug can be withdrawn only through inwards pulling the sliding panel body through the finger.