The invention discloses fitness equipment for exercising biceps brachii and belongs to the field of fitness equipment. A main purpose of the invention is to provide fitness equipment for special muscle exercise of biceps brachii of arms for vast fitness enthusiasts and fitness industry operators. According to simulation and improvement of a curved arm lifting action principle, the aim of developing the muscle strength is achieved by overcoming the weight of a counterweight. In order to achieve the aim, various parts are processed and include a counterweight unit, an upper end pulley, a drag rope, a sliding post, a guide pulley, a grip, a support pad, a rotating disc, a swing arm, a rotating shaft, a vertical bracket, a cushion, a bolt, a base pulley, a lower-end guide wheel and a base. After the various parts are processed, the parts are installed according to corresponding installation procedures and then operated and used by following instructions during use.