The utility mode discloses a digital lock which includes a lock body, a lock core and an inner lock, with the technical characteristics being as below: the lock also includes a controller, a storage connected with the controller and a digital key, wherein, a lock hole on the lock core is respectively provided with an electricity controlled bullet and a signal bullet, and the controller can be connected with the digital key inserted into the inner lock through the signal bullet; the inside of the digital key is provided with a digital chip which can be provided with a code, and the controller can compare the code in the digital chip with the originally stored code in the storage so that the lock of the electricity controlled bullet can be fulfilled by the controller when the codes are different. The utility model combines all the functions of the traditional mechanical lock and the electronic lock and has the advantages of arbitrary code reset, status alarming, simple structure and convenient installation.