Fatigue test device and method for large-size wing root connecting structure of civil aircraft

The invention discloses a civil aircraft large-size wing root connecting structure fatigue test device and method, and belongs to the technical field of aircraft structure design and test verification. The test device comprises a single stiffened wall plate butt joint structure fatigue test piece which comprises a first wing side wall plate and a second wing side wall plate, each wing side wall plate comprises a skin unit and a T-shaped stringer unit, and the skin units and the T-shaped stringer units are fixedly connected through an inner side butt joint belt plate and an outer side connecting belt plate; and the two groups of clamping and supporting structures are respectively arranged at the two end parts of the test piece, have the same structure and comprise upper clamping plates, lower clamping plates, connecting joints and supporting gaskets which are clamped at the two sides of the end parts of the test piece. According to the civil aircraft large-size wing root connecting structure fatigue test devic