Abstract: A tree pruner comprises a support rod and a cutting set. The support rod is provided at the top end thereof with a slide seat fastened thereto. The cutting set has a fastening piece fastened with a slide block capable of sliding on the slide seat. Fastened with the fastening piece is a pull rod which has a bottom end disposed pivotally in a slot of a rocking rod. The rocking rod is provided at one end thereof with a grip and is fastened pivotally at another end thereof with two connection rods which are fastened with the support rod. As the rocking rod is swung up and down, a saw which is fastened wiht the fastening piece is caused to move likewise so as to prune a twig off the tree.