The invention relates to a device for generating electricity by using ocean wave energy, which comprises an electric generator which is coaxially connected with a driving wheel, a bracket, a revolving shaft arranged on the bracket, a driving device arranged on the main shaft and used for transmitting the ocean wave energy to the electric generator and an energy absorber used for absorbing the ocean wave energy. The device for generating electricity from ocean wave energy has the advantages of simple structure, low investment cost and capability of adjusting the electricity generation according to needs.