The invention relates to the technical field of ocean engineering, in particular to an ocean engineering structure conveying device and method. The ocean engineering structure conveying device comprises a guide pipe frame and a conveying floating carrying platform. The conveying floating carrying platform is arranged on one side of the guide pipe frame. Guide rails are fixedly connected with the side face of the guide pipe frame, a fixing base is fixedly arranged on the inner side of the guide pipe frame, a rope winding roller is connected with one end of the fixing base in a rotating mode, and a towing rope is wound on the surface of the inner side of the rope winding roller. A floating carrying air cushion is fixedly arranged on the bottom side of the conveying floating carrying platform. According to the ocean engineering structure conveying device, due to the fact that guide rolling wheels and guide rolling grooves cooperate with each other, the conveying floating carrying platformcan conduct the directional floating movement along the guide rails, the phenomenon that due to the deviation of the floating movement path of the conveying floating carrying platform, the conveyingdistance is increased is avoided, and the conveying efficiency is improved advantageously. A lifting object carrying platform is lifted, the purpose that the loading area of the carrying device is temporarily increased can be achieved according to the required loading carrying quantity, and therefore the conveying device can meet the requirement for the different loading conveying quantities.