The invention discloses a method for measuring an electrified railway single-track bank section contact network lightning trip-out rate in an AT mode. The method comprises the steps of (1) obtaining electrified railway line parameters, (2) calculating the coordinates of lightning type dividing points and determining the influence areas of different lightning types of a contact network, (3) calculating an induction lightning trip-out rate, (4) calculating a shielding failure trip-out rate, and (5) determining a total trip-out rate. The method is convenient to calculate, and a problem of the difficult calculation of the electrified railway lightning trip-out rate in the AT mode is solved.