The invention provides a lost data recovery processing method and a lost data recovery processing device. The recovery processing method comprises the steps that: a first base station receives a synchronous message; the first base station identifies a lost data message in the synchronous message; and the first base station transmits a request message for requesting transmission of the data message to a second base station. By adopting the technical scheme provide by the invention, the problem that the user experience is affected by discontinuity of multicast service since synchronous frames are lost in relevant technology is solved, the base station can receive the lost data message transmitted by another base station before a Uu side dispatching moment, the lost synchronous sequence is recovered, and the discontinuity of multicast service caused by silence is avoided.