The invention discloses a 10kV line voltage regulator installation position and capacity selection method, and solves the problem that the existing 10kV line voltage regulator installation and capacity selection method is low in efficiency and unreasonable. The method of the invention comprises the following steps of: S1: counting and calculating the low voltage distribution number Yi of each tower i on a main branch line according to a 10kV distribution network feeder, and selecting the installation points of the 10kV main line and the branch line regulator, n being the total number of line towers, if a formula as shown in the description is met, showing that the 10kV line voltage is normal with no need for installation of a voltage regulator; if a formula as shown in the description is met, performing distribution transform low-voltage reason analysis, performing analysis from Yn, if Yi>0, when the reason of the low voltage of the ith tower is three-phase unbalance, having no need toinstall a voltage regulator, and when the reason of the low voltage is low 10kV voltage, allowing the position point as the selected voltage regulator installation position; and S2: according to theselected installation position in the S1, calculating the capacity of the voltage regulator at the installation position.