Optical imaging lens

The invention provides an optical imaging lens. The optical imaging lens sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an image side along an optical axis, the second lens has negative focal power; the third lens has positive focal power; the fourth lens has negative focal power; the fifth lens has negative focal power; the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface; and the seventh lens has focal power. Wherein the distance TTL from the object side surface of the first lens to the imaging surface along the optical axis and the total effective focal length f of the optical imaging lens meet TTL/flt; 1, the distance TTL from the object side surface of the first lens to the imaging surface along the optical axis, the total effective focal length f of the optical imaging lens and the maximum half field angle Semi-FOV of the optical imaging lens satisfy 2.5 lt; and TTL/f/ta