The invention discloses an electric lock cylinder. The electric lock cylinder comprises a gearbox and a mechanical lock cylinder. The gearbox comprises a shell, a motor, a worm, a worm wheel, a first gear, a second gear and an output shaft. A linkage shaft is arranged at one end of a mechanical lock cylinder shell, a first linkage pin is arranged in one end of the linkage shaft, the first linkagepin is linked with a dial wheel in an inserted mode, a spring is arranged between the linkage shaft and the first linkage pin, and the other end of the linkage shaft is connected with the output shaft of the gearbox; and a lock cylinder rotating shaft is arranged at the other end of the mechanical lock cylinder shell, one end of the lock cylinder rotating shaft is spliced with one end of a secondlinkage pin, the longitudinal center of the lock cylinder rotating shaft is provided with a circular hole, an ejector rod is placed in the circular hole, a dead bolt key is assembled at the other endof the lock cylinder rotating shaft, the other end of the second linkage pin is spliced with the dial wheel, the end face of a raised key of the second linkage pin is contacted with the end face of the first linkage pin, the other end of the second linkage pin is provided with a blind hole, and the size of the blind hole is adapted with one end of the ejector rod in a splicing way. The electric lock cylinder can solve the technical problems of convenience for unlocking, universality of the lock cylinder and the like.