The invention relates to a seating-type electric overhead saw directed to tree cutting in an electric power channel. A three-point adjustable ground foot is adopted as a base of the electric overhead saw; a lifting sleeve is vertically arranged in the center of the base; a universal platform is arranged on the upper end of the sleeve; a vertical oscillating bar is arranged on the platform; an electric saw is fixed at the front end of one side of the oscillating bar; a counterweight hammer, an operating platform and handrails are additionally arranged on the other side of the oscillating bar, so that personnel can control the electric saw easily. When the seating-type electric overhead saw is operated, the height and the angle of the electric overhead saw are selected according to the height of a tree; treetops below lead wires can be cut off on the premise of ensuring the safety, so as to ensure that a net clearance between a tree canopy and each lead wire accords with the safety operation requirement of an electric power circuit. The seating-type electric overhead saw disclosed by the invention is convenient to assemble and disassemble and simple to connect, has the working height up to about 8-10m, not only ensures the survival of the trunk part of the tree, but also cuts off the treetops influencing the safety operation of the electric power circuit, and is environment-friendly; the power supply reliability is improved and the risk that the personnel climb to cut off the tree is completely avoided.