The invention discloses a light curtain sensor optimization design method for power transmission line waving track measurement, which comprises the steps of A, estimating the maximum longitudinal speed of a power transmission line when line waving occurs; B, calculating n speed points of the maximum longitudinal speed; C, solving values of omegat corresponding to the n different speed point V; D, solving power transmission line waving track longitudinal coordinates y corresponding to the n different speed points V; E, simplifying Y according to the power transmission line waving track longitudinal coordinates y, and acquiring longitudinal setting positions of n photoelectric switches in a light curtain sensor; and F, determining positions of (2n-1) longitudinally set photoelectric switches in the light curtain sensor. According to the invention, information of each position when the power transmission line waves can be acquired accurately, thereby greatly improving the measurement precision, and reducing the equipment cost and the system complexity at the same time.