Lift for spare tyre of heavy truck

This utility model discloses a spare tire elevating apparatus for heavy trucks, comprising an arm component, a speed reducer component, a positioning baffle component, a top pulley component, a safety apparatus and a steel cable, wherein the arm component consists of an arm and an arm bottom board whereon a bottom pulley for coiling up the steel cable and the arm axle are arranged. The spare tire is arranged on the arm which is rotatablely installed on the arm axle. The top portion of the arm is connected to the speed reducer through a steel cable that encircles through the top pulley and the bottom pulley. The utility model dramatically reduces the labor intensity, speeds up spare tire changing and is simple in structure, low in failure rate, high in maintainability, wide in application range and low in cost.