Electric high-speed escalator with speed changeable

The invention relates to an electric high-speed escalator with speed changeable. The electric high-speed escalator comprises a keel frame of a curve closed-loop type and a plurality of pedal frames sequentially arranged on the outer side of the keel frame. The electric high-speed escalator further comprises steering drive devices and speed changing drive devices, each speed changing drive device is composed of a speed increasing mechanism, a constant speed mechanism and a speed reducing mechanism, a front wheel grooved rail and a rear wheel grooved rail are respectively arranged on the outer side and the inner side of the keel frame, and one steering drive device, one speed increasing mechanism, one constant speed mechanism, one speed reducing mechanism, the other steering drive device, the other speed increasing mechanism, the other constant speed mechanism and the other speed reducing mechanism are sequentially arranged in an annular shape in the middle portions of the rear wheel grooved rails on the two si