The invention relates to an electric expansion pedal for bus stands. The electric expansion pedal for bus stands comprises a fixed pedal body 1, a movable pedal body 2, a sliding block 3, a sliding rail 4, a limiting block 5 and a limiting switch 20, and further comprises a fixed pedal body lug seat 6, a rear support lug 7, a base 8, a motor 9, a coupling 10, a lead screw 11, a bearing 12, a nut 13, a push rod 14, a supporting base 15, a guide sleeve 16, a cylinder barrel 17, a front support lug 18, a movable pedal body lug seat 19, a sensing rack 21 and a proximity switch 22. A transmission element is arranged in the closed cylinder barrel so that the transmission element is not prone to damage, and the electric expansion pedal is good in environmental adaptability and not liable to hurt passengers. The proximity switch is installed at the end of the movable pedal body and can detect barriers ahead, and the movable pedal body stops automatically in front of the barriers, that is, the extension length of the movable pedal body is adjusted automatically according to the positions of the barriers ahead. The electric expansion pedal is applicable to bus stands.