The invention provides a reverse time migration imaging method and device. The method includes the following steps that: a shot of data are obtained; a depth domain velocity field is transformed to pyramid grids from regular grids; the coordinates of anisotropy parameters delta and epsilon, a symmetry axis tile angle parameter theta and a symmetry axis azimuth parameter phi are transformed to the pyramid grids from the regular grids; finite difference wave field simulation is performed on a wave field generated by excitation by using a coupling second-order partial differential equation of the pyramid grids, so that a wave field corresponding to a shot point and a wave field corresponding to a detection point can be obtained; imaging is performed on the wave field corresponding to the shot point and the wave field corresponding to the detection point by using a cross-correlation imaging condition; an imaging result is interpolated to the regular grids, the imaging result which has been interpolated to the regular grids is adopted as a single-shot imaging result of the shot point. With the method and device of the invention adopted, the technique problem that changing grids cannot be utilized to perform imaging in a horizontal direction and a vertical direction simultaneously can be solved, and changing grids can be utilized to perform imaging in a horizontal direction and a vertical direction simultaneously in a horizontal direction and a vertical direction.