The utility model relates to a dry -type air -core reactor interturn insulation detection device, including motor vehicle, high voltage direct current genera tor, voltage regulator, oscilloscope and switch board. High voltage direct current genera tor, voltage regulator, oscilloscope and switch board are all installed in the carriage of motor vehicle, switch board and voltage regulator, oscilloscope electric connection, voltage regulator and high voltage direct current genera tor electric connection. During field test, the motor vehicle removes and is close to the dry -type air -core reactor who treats the detection, just mainly detects equipment transportation with high voltage direct current genera tor, voltage regulator, oscilloscope and switch board etc. And carries to test site, need not to get off main check out test set such as high voltage direct current genera tor, voltage regulator, oscilloscope and switch board to arrange the equipment, and the equipment is arranged at the test unit scene that only needs to discharge. So, assembled component is few during interturn insulation testing, may not rely on outside hoisting machine tool equipment, has effectively improved test efficiency, has reduced staff's intensity of labour.