The invention discloses a wide-angle lens. The wide-angle lens sequentially comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens and a sixth lens along an optical axis from an object side to an image surface, wherein the first lens has a negative focal power, the second lens has a negative focal power, the third lens has a positive focal power, the fourth lens has a positive focal power, the fifth lens has a negative focal power, the fourth lens and the fifth lens are combined to form a lens group, the sixth lens has a positive focal power, the first lens and the third lens both are glass spherical lenses, the second lens, the fourth lens, the fifth lens and the sixth lens are all plastic non-spherical lenses, the wide-angle lens conforms to a condition formula of 1.5<TTL / R3<3, TTL expresses optical overall length of the wide-angle lens, and R3 expresses curvature radius of an object side surface of the second lens. The wide-angle lens has the advantages of miniaturization, low cost, large wide angle and the like and can have favorable resolution in an outer extremely-severe environment.