Seismic action tends to result in the liquefication failure of offshore fan foundation in the sand deposit. Monopile-bucket hybrid foundation is a novel type of offshore fan foundation, combining the advantages of monopile and suction bucket foundations. To investigate the seismic response of this hybrid foundation in sand, a series of centrifugal shaking table model tests of monopile and the hybrid foundations in dry and saturated sand were conducted. White noise and seismic waves with different frequency spectrum components were used to stimulate the vibration for obtaining the natural vibration frequency, excess pore pressure accumulation of foundation soil, acceleration response of the offshore wind system and foundation bending moment distribution of the two foundation forms in sandy soil. The results show that the excess pore pressure of soil in saturated soil decreases in shallow depth under the bucket component of the hybrid foundation,while the acceleration amplitude is enlarged correspondingly. The shallow bending moment response of the monopile in saturated site is relatively larger with the turbine exhibiting obvious residual displacement. Compared with the monopile, the hybrid foundation shows greater acceleration response and smaller horizontal displacement in tests. The study provides a fresh reference for the seismic design of offshore wind structures with monopile and monopile-bucket hybrid foundations.