The present invention discloses a seismic array of an underwater earthquake simulation vibrostand. The seismic array comprises a seismic array pedestal arranged on a power base, and a deep pool arranged on the seismic array pedestal. Two vibrostand surfaces are arranged in the deep pool. The lower parts of the vibrostand surfaces are provided with a horizontal actuator, a vertical actuator and a guide device arranged via a hydrostatic back-up. One side of the deep pool is provided with a reaction wall, and the other side of the deep pool is provided with an oil transmission pipeline for connecting an oil pump station with an accumulator group. The inner side thereof is provided with a wave maker group. The bottom of the reaction wall and the lower part of the deep pool are respectively provided with manholes. According to the invention, the dynamic test on large engineering structure under the coupling excitation effect of waves, the water flow and the earthquake is realized. meanwhile, the coupling effect of multi-point and multi-dimensional earthquake and wave power is realized. The seismic array is long in period, large in displacement, good in high-frequency seismic property and higher in operability. The synchronous / asynchronous control of two vibrostands, the generation of waves and seawater, and the synchronous / asynchronous control of the vibrostand seismic array excitation are realized.