Multifunctional door lock

Disclosed is a multifunctional door lock, comprising a lock case (1), a front handle (2), a rear handle (3), a connection assembly (4), a lock plug assembly (5), a lock bolt assembly (6) and a locking/unlocking mechanism (7). The locking/unlocking mechanism (7) and the lock bolt assembly (6) are both installed inside the lock case (1); an inner end of the front handle (2) and an inner end of the rear handle (3) are movably sheathed in a front portion and a rear portion of the lock case (1) respectively; the front handle (2) and the rear handle (3) are connected by means of the locking/unlocking mechanism (7) and the connection assembly (4); the lock plug assembly (5) is installed in the front handle (2); locking/unlocking is achieved by an electric motor (74) in the locking/unlocking mechanism (7) via an electric motor spring (73), a push rod (76), an electric motor clamping block (77) and a reset block (78); and locking/unlocking is achieved by the lock plug assembly (5) via a cam (730), a mechanical clamping block (710) and a mechanical spring (720). Unlocking in a mechanical manner and unlocking by means of an electronic system are two complete systems in terms of structure, the two systems do not interfere with each other during locking and unlocking, and a mechanical key is designed in such a way that the key can be inserted in or pulled out only in a locking state.