A bicycle brake lock device and a bicycle brake assembly comprising the same. The device comprises a separate lock means that can restrain a first and a second rotation link of a bicycle brake in a brake operating state to prevent the rotation thereof. Therefore, even without a separate lock device such as a lock, the lock means can simply operate in a lock mode to make the riding of a bicycle impossible, and thus can prevent the bicycle from being stolen. Also, a user can safely fix and restrain a bicycle through a lock means by carrying only a lock key without carrying a separate big and heavy lock device, and thus more conveniently use the bicycle. In particular, a bicycle can be prevented from being stolen even by use of a tool such as a cutter, and thus achieves an enhanced safety from the bicycle theft.