The embodiment of the application discloses a reverse-time migration imaging method and device. The reverse-time migration imaging method comprises the steps that a mapping relation between theoretical angular frequency corresponding to the seismic wave field of a target area and numerically calculated angular frequency is constructed; first seismic data spectrum corresponding to the theoretical angular frequency is mapped into second seismic data spectrum corresponding to the numerically calculated angular frequency by utilizing the mapping relation; and reverse-time migration processing is performed on the second seismic data spectrum after mapping so that a migration image is obtained. With application of the reverse-time migration imaging method and device, the phenomenon of numerical dispersion generated in seismic data imaging can be effectively avoided so that the computational effort can be reduced.