The invention discloses a wing of a flapping-wing air vehicle. The wing comprises a first connecting rod assembly and a second connecting rod assembly, wherein the first connecting rod assembly comprises a first connecting rod and a second connecting rod, a first connecting rod connecting site, a first hinging site, a second hinging site and a driving connecting rod; the second connecting rod assembly comprises a third connecting rod and a fourth connecting rod; the driving connecting rod comprises a driving connecting rod connecting site; the second hinging site is located between the first connecting rod connecting site and the first hinging site; and the first connecting rod assembly further comprises a fifth connecting rod, a sixth connecting rod and a telescopic connecting rod. The invention further discloses a flapping-wing air vehicle. The flapping-wing air vehicle comprises the wing, a stander, a swing device, a translation device and a power device. By virtue of the structuralconfiguration, the flapping-wing air vehicle is compact in structure; and compared with a previous bionic air vehicle, the flapping-wing air vehicle is capable of bearing relatively large flight weight and is relatively close to flight actions of birds.