The invention provides a missile launching device. The missile launching device comprises a launching canister body and a slide strip; an outer surface of the slide strip is installed along the innerwall of the launching canister body; an inner surface of the slide strip can be applied with an outer surface of a missile. Since the slide strip is pasted to the inner wall of the launching canisterbody so that the slide strip forms a projection in the radial direction and facing the center of the launching canister body and can be in touch with the outer surface of a missile body directly; thecontact area of the projection is far less than the cylindrical area of the whole launching cylinder body; therefore, the drag reduction is achieved.