The invention discloses a wide-angle lens which comprises a first lens group with negative focus length, a diaphragm and a second lens group with positive focus length from an object, wherein the first lens group comprises a first lens with negative focus length, a second lens with negative focus length and a third lens with positive focus length; the second lens group comprises a fourth lens, a fifth lens and a sixth lens, the fourth lens is provided with positive focus length, and the fifth lens and the sixth lens have positive focus length after being glued; and the first lens group and the second lens group meet the following condition of -3<fL1 / fL2<-0.5, wherein fL1 expresses the combined focus length of the first lens group, and fL2 expresses the combined focus length of the second lens group. By adopting six full-glass lens structures, the invention has the advantages of compact structure, better machining manufacturability and low production cost. The wide-angle lens has better imaging quality under the condition of ensuring wide angle, and improves the imaging quality because the whole optical system enlarges the tolerance.