Encryption device

The utility model relates to the technical field of computers, in particular to an encryption device which comprises an encryption body, a connecting end, an external connection cylinder, an external connection plate and an elastic sleeve, the connecting end and the external connection plate are arranged at the two ends of the encryption body respectively, the external connection cylinder is detachably connected with the external connection plate and located on the outer side wall of the encryption body, and the elastic sleeve is communicated with the external connection cylinder. The connecting end is wrapped; the elastic sleeve comprises a contact ring, a clamping piece, a telescopic sleeve and a connecting piece, in the inserting process, part of gas in the elastic sleeve is exhausted, the telescopic sleeve is compressed towards the direction of the external connecting cylinder, and after the connecting end is completely inserted, the contact ring is tightly attached to the outer side of the computer inter