A diesel vehicle engine synchronous belt comprises an endless belt. The endless belt comprises second asbestos cloth, first aramid fiber cords, first asbestos cloth, second adhesive glue, a tooth layer, a fourth adhesive layer, first heat emission holes, second heat emission holes, polyester staple fibers, a third adhesive layer, first adhesive glue, reinforcing ribs, steel cords, asbestos cloth covers, a second adhesive layer, an imitation lining leather elastic layer, second aramid fiber cords, third aramid fiber cords and a first adhesive layer; the second aramid fiber cords are embedded in the first adhesive layer in the width direction of the synchronous belt, the third aramid fiber cords are connected between two adjacent second aramid fiber cords, the imitation lining leather elastic layer is under the first adhesive layer, and the second adhesive layer is arranged under the imitation lining leather elastic layer. The diesel vehicle engine synchronous belt has the advantage that the steel cords and the aramid fiber cords serve as a reinforced skeleton simultaneously.