Abstract: In background of rapidly developing renewable energy, the installed capacity of renewable energy such as wind and solar continue to increase. However, due to the limited adjustment ability of power grid and many other reasons, the phenomenon of abandoning wind power and photovoltaic become serious, which leads to a great waste of energy. Meantime, people’s demand for other kinds of energy other than electricity is growing. It brings a lot of pressure to the supply to all kinds of energies. By coupling and storage of multiple energies, the local consumption of wind power and photovoltaic can be promoted. At the same time, the supply of all kinds of energies raise and the pressure is released. Based on the scene of offshore island micro grid, this paper proposed the model of six-energy offshore island self-consistent system with supply and demand and divided it into supplement side, conversion side, and load side based on the conception of energy hub. Then, the day-ahead optimization scheduling model was established by considering the total cost of purchasing energy from the external network in a whole day as the objective function and the constraint conditions of each part. At last, comparing with coupling reduced and electric storage alone case in the simulation, the necessity of polymorphic energy coupling and storage medium are validated; meantime, the impact of the price of each kind of energy on energy coupling is analyzed. And it is proved that this proposed model can increase the consumption of renewable energy and decrease the total cost of purchasing energies.