The utility model discloses a bearing drive mechanism for subway shield door, stand are two, are left and right symmetric distribution, the quick -witted roof beam horizontal installation of door forms the steel frame construction of subway shield door on two stands, wear -resisting round steel guide rail installs in the inside of door machine roof beam, and follows door quick -witted roof beam level setting, and drive mechanism installs in the inside of door machine roof beam, and is located wear -resisting round steel guide rail's top, bearing wheel, prevent jumping the wheel and all installon bearing the mechanism, it for two sets of, just are left and right symmetry through bearing wheel and install in wear -resisting round steel guide rail top to bear the mechanism to can follow thesome horizontal migration that correspond the wear -resisting round steel guide rail of side, two sets of drive ends that bear the mechanism are connected with drive mechanism respectively realizes the linkage, door carrying frame installs in the below of bearing the mechanism, and the sliding door fan is installed on door carrying frame. The utility model provides rise overall structure's intensity and rigidity, make with low costs, transportation and simple to operate, the structure is ingenious, realizes having good application prospect easily.