Encrypted USB (Universal Serial Bus) flash disk

The utility model provides an encrypted USB (Universal Serial Bus) flash disk. The encrypted USB flash disk comprises a CPU (Central Processing Unit), a USB interface, a Flash storage, a passive encrypted IC (Integrated Circuit) and an NFC (Near Field Communication) antenna which is wirelessly connected with an NFC cell phone, wherein the CPU is connected with the Flash storage; the USB interface is connected to the CPU and the Flash storage respectively; the passive encrypted IC is connected with the CPU; and the NFC antenna is connected with the passive encrypted IC. The encrypted USB flash disk has the advantages that decoding, unlocking and locking of the encrypted USB flash disk can be realized by transmitting an identifying code to the encrypted USB flash disk by using the NFC cell phone; the decoding, unlocking and locking can be realized on line or off line, and the encrypted USB flash disk is automatically locked after being used and pulled off; and the encrypted USB flash disk is convenient to use and the data security can be effectively guaranteed.