A detachable electronic device and a dock thereof are provided. The detachable electronic device includes a first machine body, a second machine body, and a dock. The dock includes a pair of fixing brackets, a pair of rotating axles, a latch module disposed between the rotating axles, a lock base, and a linkage kit. The latch module can be arranged in a locked state or an unlocked state to lock or release the second machine body. The lock base is slidably disposed on one of the fixing brackets. The linkage kit has one end fixed to the latch module, and the other another end slidably sleeved onto the lock base. When an anti-theft lock is locked to the lock base, the lock base restricts a displacement of the linkage kit, and the linkage kit restricts the latch module to the locked state.