Foldable bionic flapping wing and aircraft

The invention provides a foldable bionic flapping wing which is characterized in that a folding mechanism comprises a first folding wing, a second folding wing, a third folding wing and a fourth folding wing, one end of the first folding wing is connected with one end of the fourth folding wing, the other end of the fourth folding wing is connected to the third folding wing, one end of the third folding wing is connected with one end of the second folding wing, and the other end of the second folding wing is connected to the first folding wing; the first connecting point, the second connecting point, the third connecting point and the fourth connecting point are sequentially positioned at four vertexes of the parallelogram in the folding process of the flapping wing; one end of a first connecting rod is connected with the first flap, the other end of the first connecting rod is fixedly connected to the aircraft, one end of the pull rod is connected to the first flap, and the other end of the pull rod is slida