A vibration isolation means for a human-seat-boat-water dynamic interaction system subject to sea waves is proposed, for which to be numerically analyzed, the governing equations with numerical solution approaches are developed. The key idea is adopting electromagnetic isolators to replace often-used seat-damper to reduce vibrations by harvesting wave energy. The human body is modelled as a mass supported by a spring-damper connected to a seat, that through the electromagnetic isolator connected to a boat simplifying as a uniform beam-like vessel travelling in sea way. The wave force in the model is an approximate form commonly used in dynamic analysis of marine engineering, consisting of three components proportional to the relative motion of ship to the water, which adds additional mass, stiffness, and damping onto the ship. The parameters in the simulations are chosen from the practical designs or experimental/numerical reports. The simulation results reveal the effects of integrated interactions on the natural frequencies and dynamic responses of the ship subjected to short/long water waves and show very large reductions of human vibration level and effectively collecting wave energy. This confirms the proposed numerical model for ship vibration reduction and wave energy collection is attractive to simulate this complex integrated interaction system, and the proposed means based on electromagnetic isolators is no doubt to realize the aim of the paper. Some guidelines for designing this type of isolators are presented, which would be one of further develop directions for the global plan seeking/collecting green energies.