Optical imaging lens

The invention discloses an optical imaging lens, which comprises a first lens barrel, a second lens barrel, an optical lens group and a spacer group, and is characterized in that the spacer group comprises a fourth spacer and a fifth spacer; the optical lens group comprises a first lens group and a second lens group. The first lens group comprises first, second and third lenses; the second lens group has negative focal power and comprises a fourth lens, a fifth lens and a sixth lens, the fourth lens has positive focal power, and the fifth lens and the sixth lens have negative focal power; the first lens group is arranged in the first lens barrel, and the second lens group, the fourth spacer and the fifth spacer are arranged in the second lens barrel; the combined focal length f456 of the fourth lens, the fifth lens and the sixth lens, the inner diameter d4s of the object side surface of the fourth spacer and the inner diameter d5s of the object side surface of the fifth spacer meet the following conditions:-1