The invention relates to an electrically-controlled gangway door used for a high-speed railway and an installation method. The door comprises a base cavity. The left side in the base cavity is provided with a lower motor. The lower part of the lower motor is connected with a lower motor shaft. The lower shaft of the lower motor shaft is provided with a lower driving flywheel. The upper part of the base cavity is provided with a lower slideway. The right side at the upper part of the lower slideway is provided with a compartment wall body. The upper part of the compartment wall body is provided with an upper slideway. The upper part of the upper slideway is provided with a rotary shaft. Upper and lower parts of the rotary shaft are connected with an upper driven flywheel and a lower driven flywheel. The outside of the compartment wall body is provided with a gangway door. The electrically-controlled gangway door used for the high-speed railway and the installation method have the following beneficial effects: the gangway door of the high-speed railway can be effectively utilized and is convenient to use and controlled according to needs; the electrically-controlled gangway door is convenient to install with high using efficiency; and the electrically-controlled gangway door facilitates installation of the high-speed railway.