A cleaning structure for endoscope lens includes a sleeve main body having a fitting hole, at least one first axial fluid passage and a first opening. The fitting hole communicates with two ends of the sleeve main body. The first axial fluid passage is axially formed in a wall of the sleeve main body. The first opening is formed at one end of the sleeve main body in communication with the first axial fluid passage. The sleeve main body is fitted around the lens of the endoscope. A fluid is supplied to the fluid passage structure of the sleeve main body and ejected from the opening to clean up the surface of the lens of the endoscope so as to keep the surface of the lens clean.
