Spring bolt monitoring mechanism and door lock

The utility model provides a spring bolt monitoring mechanism which is applied to a coded lock with a spring bolt, a lock cylinder and a lock box to detect the unlocking state or the locking state of the coded lock, a main body of the spring bolt is arranged in the lock box, when the coded lock is in the locking state, the end, extending out of the lock box, of the spring bolt abuts against the lock cylinder, and when the coded lock is in the unlocking state, the spring bolt is in the locking state. After the lock cylinder rotates, the lock tongue can be driven to retract into the lock box; the lock tongue monitoring mechanism comprises a Hall switch and a controller, the Hall switch comprises a Hall element and a trigger magnet, the Hall element is arranged on one side of the lock cylinder, the trigger magnet is arranged on the peripheral wall of the lock cylinder, and the position of the Hall element right faces the trigger magnet in the unlocking state so that a trigger signal can be output in the unlockin