High lift device of double-aisle large-type passenger plane

The utility model provides a high lift device of a double-aisle large-type passenger plane. The high lift device comprises a leading edge slat, a main wing and a trailing edge flap, wherein the outside shape of the leading edge slat is the same as the shape of a front edge of the wing profile of a wing; the shape of a front edge of the main wing is the same as the inside shape of the leading edge slat; the shape of a rear edge of the main wing is the same as the head shape of the trailing edge flap; the inside shape of the leading edge slat and the head shape of the trailing edge flap are formed by an elliptic equation and a quadratic curve; and the chord length ratio of the leading edge slat, the main wing and the trailing edge flap and seam parameters of the leading edge slat and the trailing edge flap in a take-off state and a landing state are set. Compared with independent wing profile, the high lift device provided by the utility model has the advantages that: the plane has the maximum lift ratio while meeting the requirement of high lift coefficient in the take-off state, and has the maximum lift coefficient in the landing state.