The invention, which belongs to the field of seismic signal processing, particularly relates to a seismic data imaging method for a carbonate rock fault in an igneous rock complex area of and equipment. The method comprises: pre-processing seismic data to obtain amplitude-preserved seismic gather data; with a fine-engraving technique of the igneous rock under geological constraints, establishing apermian-system igneous formation velocity model; acquiring seismic data of a dominant frequency band by using a frequency division processing method and establishing a background velocity model of the Ordovician strata and the Cambrian strata; carrying out fault-controlling Gaussian beam tomography under the constraints of seismic attributes and updating a velocity model at the deep fault to obtain a high-precision velocity model; and acquiring a high-precision imaging result by using the broadband RTM imaging technology. Therefore, the imaging precision of the seismic data processing of thesubsurface deep fault under the igneous rock at the desert surface is improved; and thus the technical support for the seismic imaging of the fault in the Shunbei oil and gas field and similar background regions at home and abroad is provided.