Collimating lens barrel, laser cutting head and laser cutting device

The invention relates to the technical field of laser processing, and discloses a collimating lens barrel, a laser cutting head and a laser cutting device. A collimating lens barrel structure comprises a first connecting part, a second connecting part, a collimating lens barrel and a lens barrel adjusting part, the first connecting part and the second connecting part are detachably connected, containing space is arranged at the contact position of the first connecting part and the second connecting part, an opening is formed in the upper end of the containing space, and the collimating lens barrel is arranged in the containing space; the lens barrel adjusting part is arranged on the opening and is used for adjusting the position of the collimating lens barrel in the containing space; and accordingly, the collimating lens barrel can be conveniently and rapidly replaced and adjusted.