The invention discloses a tricycle range extender. The tricycle range extender comprises a tricycle rack and a driving box, wherein a storage battery device and a driving motor are arranged in the driving box; the storage battery device comprises a storage battery group and a charging engine structure; the charging engine structure comprises a general-purpose engine body; an oil storage tank, a mounting panel, a stator tray, stators, a rotor, and a controller connected with the power-supply output end of the general-purpose engine body are arranged on the general-purpose engine body; the rotor is arranged in the stator tray and fixedly connected with an output shaft; the controller is connected with the storage battery group; sound isolation nets are arranged on the inner walls of the stator tray; a sound baffle screen is arranged in a protective cover; a heat dissipating fan is arranged between the sound baffle screen and the protective cover; a heat dissipating window is formed in the protective cover. The tricycle range extender disclosed by the invention is simple in structure, and convenient and rapid to operate. Through the adoption of the tricycle range extender, energy sources can be effectively saved; the service life of the storage battery group is prolonged; the service life of the stators and the service life of the rotor are prolonged. The tricycle range extender is high in stability and applicability.