The invention belongs to the technical field of fingerprint door locks, and particularly relates to a combined electric door lock. For the problems that under the special condition, the service life of a fingerprint door lock is short and the burglary prevention performance is not strong enough, the following solution is put forward. According to the solution, the combined electric door lock comprises a protection shell, the protection shell is of a groove-shaped structure with an opening in the top, a dustproof cover is hinged to the top of the protection shell, an electric door lock structure is fixed in the protection shell and located under the dustproof cover, a rectangular fixed block is fixed to one end of the dustproof cover, and a connection block is fixed to the end, close to the rectangular fixed block, of the protection shell. In the combined electric door lock, by using password rings, a guide groove, slide columns, rectangular locking blocks, springs, the fixed block and other structures in cooperation, a password needs to be used for opening the dustproof cover, and therefore the first layer of code protection can be conducted on the electric door lock, and the burglary prevention performance of the electric door lock can be better.