The invention provides a non-linear air spring. The non-linear air spring comprises an upper cover plate, an air bag, an auxiliary spring and a bottom plate, all of which are sequentially arranged. The auxiliary spring comprises a first rubber pile and a second rubber pile, wherein the first rubber pile and the second rubber pile are connected in series in the longitudinal direction of the air spring. The first rubber pile and the second rubber pile are internally hollow to form a cavity, the first rubber pile is adjacent to the air bag, a first rubber pile top plate is arranged on the side, adjacent to the air bag, of the first rubber pile, the first rubber pile top plate covers the top end of the first rubber pile and the top end of the cavity, a first limiting portion stretching into the cavity is formed on the first rubber pile top plate, a second limiting portion stretching into the cavity is formed on the bottom plate, the second limiting portion and the first limiting portion are spaced in the horizontal direction, the second limiting portion can limit displacement of the first limiting portion in the horizontal direction, the non-linear characteristic of the rigidity in thehorizontal direction is achieved, and the transverse stability and comfort of a vehicle are guaranteed.