A smart lock of a bicycle includes a bicycle locking apparatus and a dock locking apparatus. The bicycle locking apparatus works with a key to lock the bicycle without dock, and the dock locking apparatus works with a dock to lock the bicycle to the dock. The bicycle locking apparatus includes a gear, a locking member, and a driving module. The locking member has a locking tooth portion, the driving module moves the locking member to engage and disengage the locking tooth portion of the locking member with an engaging portion of the key. The dock locking apparatus has a locking latch and a stop member. The driving module moves the locking member to let the stop member against or away from the locking latch to lock or unlock the bicycle to the dock.