The invention provides a self-adaptive rhombic wing layout of air vehicles. According to the self-adaptive rhombic wing layout of the air vehicles, a nose, a tail, four wings, an engine, a task bin, four connecting arms, hinges and control vanes are involved. The four wings are arranged in a rhombic mode from front to back. The four connecting arms can be telescoped and are transversely or longitudinally arranged in a crisscross mode. The nose and the wings are connected through the hinges, the tail and the wings are connected through the hinges, and the engine and the wings are connected through the hinges. The task bin is connected with the nose, the tail and the engine through the telescopic connecting arms and can be changed according to task requirements. The wings are provided with the control vanes used for controlling flight attitudes. The sweepback angle and the sweep-forward angle of the wings can be changed by telescoping the connecting arms so as to obtain rhombic wing layouts adapting to different flight speeds and improve the aerodynamic performance. The self-adaptive rhombic wing layout of the air vehicles has the advantages of being simple and reliable in structure, low in cost and multiple in function.