The invention discloses a mariculture device based on upright-type offshore wind turbine foundations. The device comprises four upright-type wind turbine foundations inserted into a seabed, and a working platform located on the upright-type wind turbine foundations, wherein each upright-type wind turbine foundation is sleeved by a first sleeve and a second sleeve; the adjacent first sleeve and the adjacent second sleeve are connected by a main rope respectively; a culture net cage is installed on the main rope; a lifting device is installed on each upright-type wind turbine foundation; and the working table controls the lifting devices to drive the first sleeves and the second sleeves to move up and down along the upright-type wind turbine foundations, so that vertical motion of the culture net cage is driven. The mariculture device based on the upright-type offshore wind turbine foundations disclosed by the invention is characterized in that overall steady ascending and descending of the net cage can be achieved with a lifting system, so that a consequence of net cage damage caused by unsteadying ascending and descending can be avoided, and huge damage brought by typhoons to the mariculture net cage can be prevented; the manufacture cost is low; installation is convenient; and the service life is long, etc.