The invention discloses a composite blade and tip counterweight method for an unmanned helicopter. The tip parabola trimming counterweight design comprises a tip counterweight lead block, a front edgecounterweight pipe with a parabolic surface, a front edge counterweight bolt, a rear edge counterweight pipe and a rear edge counterweight bolt, wherein the tip counterweight lead block is placed atthe front edge position of the tip when a blade is manufactured; the front edge counterweight pipe with the parabolic surface is cast in the tip counterweight lead block, and the parabolic surface ofthe front edge counterweight pipe is consistent with the appearance of the blade and the parabola trimming tip; and the rear edge counterweight pipe is placed at the rear edge position of the tip whenthe blade is manufactured. The invention also discloses a composite blade and parabola trimming tip counterweight method for the unmanned helicopter. The parabola trimming tip counterweight design has a beautifully designed structure and simple operation of the trimming method. The dynamic and static balance of the blade can be effectively adjusted without affecting the aerodynamic efficiency ofthe blade; and the method is safe and reliable and can be repeatedly operated.