The invention discloses a method for locating turn-to-turn insulation defects of a dry type air-core reactor. The method comprises the following steps of: 1, establishing a superposed circuit formed by mutually superposing a power-frequency circuit and a high-frequency pulse oscillation circuit; 2, connecting one end of the dry type air-core reactor to a first detection point of the superposed circuit, and connecting the other end of the dry type air-core reactor to a second detection point of the superposed circuit; and 3, disconnecting a second switch K1, connecting a first switch K so as to connect the dry type air-core reactor L to the high-frequency pulse oscillation circuit, judging whether the dry type air-core reactor L has turn-to-turn insulation defects, if so, carrying out steps 4-6: judging whether the turn-to-turn insulation defects are metallic breakdown, low-resistance breakdown and high-resistance breakdown in sequence, and locating the defects according to different defect properties. According to the method disclosed by the invention, a gap of incapability of locating the turn-to-turn insulation defects of the traditional dry type air-core reactor is filled, thus, the defects are precisely located.