Lock with replaceable key

The utility model belongs to the field of locks, and discloses a lock with a replaceable key. The lock comprises a lock shell, a lock container, a first key detector, a second key detector and a propeller. The lock shell is provided with an unlocking insertion position and a template insertion position, the propeller is connected to the unlocking insertion position and the template insertion position in an associated mode, the first key detector detects an unlocking key inserted into the unlocking insertion position, and the second key detector detects a template key inserted into the template insertion position through connection of the propeller; when the first key detector detects that the unlocking key is associated with the template key, the first key detector and the second key detector detect that the unlocking key is associated with the template key, so that the lock cylinder rotates; and when it is detected that the unlocking key is not associated with the template key, the first key detector and the