The invention discloses a lock cylinder cover cap riveting device and a riveting method thereof. The lock cylinder cover cap riveting device comprises a cover cap feeding device, a cover cap special product detecting device, a special product discharging device, an on-line cover cap detecting device, a lock cylinder feeding device, a lock cylinder aligning device, a lock cylinder overturning device, a riveting and pressing device, a riveting and pressing detecting device and a finished product classifying collecting device. The lock cylinder cover cap riveting method comprises the cover cap feeding step, the cover cap special product detecting step, the special product discharging step, the on-line cover cap detecting step, the lock cylinder feeding step, the lock cylinder aligning step, the lock cylinder overturning step, the riveting and pressing step, the riveting and pressing detecting step and the finished product classifying collecting step. According to the lock cylinder cover cap riveting device and the riveting method thereof, rotary table mode running is adopted, cover cap feeding, cover cap special product detecting, cover cap transferring, cover cap special product discharging, on-line cover cap detecting, lock cylinder feeding, lock cylinder aligning, lock cylinder overturning, riveting and pressing, riveting and pressing detecting and finished product classifying collecting are finished in a full-automatic mode, full-automatic operation is achieved, the production efficiency is improved, and the manual operation is simplified.