Large-scale collateral kirchhoff prestack depth migration method and device

The embodiment of the invention provides a large-scale collateral kirchhoff prestack depth migration method and device. The method comprises the steps that data to be migrated are stored as a plurality of offset files, and offsets of the data, to be migrated, in the same offset file are the same; all nodes participating in calculation of kirchhoff prestack depth migration are divided into a plurality of node groups; all the node groups are triggered for carrying out kirchhoff prestack depth migration calculation on the different offset files, one offset file is read by triggering a group leader node of the corresponding node group and broadcast to the group nodes of the corresponding node group, each node in the node group is triggered to obtain one imaging task of the corresponding offset file and a common imaging point travel-time list corresponding to the imaging task, and according to the obtained common imaging point travel-time lists, migration calculation of all the imaging tasks is finished independently. According to the scheme, the effect of intensity of network transmission of the seismic data is achieved, and the problem of local I/O due to the fact that the travel-time lists are read many times can be avoided.