The invention discloses a two-way driving separable auxiliary vehicle system. The two-way driving separable auxiliary vehicle system comprises a main vehicle, a main lane, an auxiliary vehicle and auxiliary lanes; the main vehicle comprises a main vehicle head and a main locomotive set; the main vehicle drives on the main lane; the auxiliary vehicle comprises an auxiliary vehicle head and auxiliary compartments, and the auxiliary vehicle head and the auxiliary compartments are of split structures; the auxiliary lanes are arranged on the two sides of the main lane and connected with the main lane at a platform; the auxiliary lane on one side serves as a getting-on auxiliary lane, and the auxiliary lane on the other side serves as a getting-off auxiliary lane; and the auxiliary compartmentsare hung at the rear face end of a last locomotive of the main locomotive set. According to the two-way driving separable auxiliary vehicle system, the auxiliary lanes are additionally arranged underthe situation that an original main lane is not changed, the auxiliary compartments for getting-on and getting-off of passengers are arranged at the tail part of the locomotive set, the structure of the original locomotive set cannot be changed, and non-stopping getting-on and getting-off of the passengers are achieved under the situation that an existing rail system is changed less.