The invention discloses a medium-span aircraft shell structure and an aircraft and relates to the field of underwater high-speed flying. The medium-span aircraft shell structure comprises a head cabinsection, a main body cabin section as well as a hydrophilic coating and a lyophobic coating, wherein the hydrophilic coating is arranged on the lower surface of the main body cabin section; and the outer surface of the lyophobic coating is covered by the head cabin section. According to the medium-span aircraft shell structure and the aircraft disclosed by the invention, asymmetric vacuoles of asymmetric design are adopted for passive control on underwater postures of the aircraft, the shape of the head cabin section is not particularly required, and in addition, a control device and an execution device are not additionally needed, so that the appearance design requirements on aircraft shells are reduced, and the medium-span aircraft shell structure is low in production cost, good in controllability and reliability and good in engineering application prospect.