The invention, which relates to the technical field of energy exploration, provides an imaging method and system of a cross-hole seismic local inclination angle domain. The method comprises: obtaining position information of an excitation well, position information of a receiving well and position information of a detector in the receiving well; obtaining a pre-set focus wave field, the preset number of bombs, a preset maximum depth and a preset progressive increasing step length; according to the maximum depth and the progressive increasing step length, the number of layers of continuations is determined; on the basis of the position information of the excitation well, the position information of the receiving well, the position information of the detector in the receiving well, the number of layers and the number of bombs, a local wave-number domain imaging matrix of the focus wave field is determined; and on the basis of the local wave-number domain imaging matrix, a local inclination angle domain is determined. Therefore, calculation of cross-hole seismic imaging of different underground local inclination angle domains is realized; a local directive imaging analysis can be carried out on the underground structure conveniently; and the lithologic oil-gas reservoir exploration can be guided.