The invention discloses a double-column blowing-needle-height-automatic-adjusting nitrogen blowing concentrator and belongs to the field of a nitrogen blowing concentration or purification device. Thenitrogen blowing concentrator comprises a heat insulation shell base, a heating plate, a heating tank, a test tube stand, a nitrogen blowing device, a temperature sensor and an integrated control device. The heating plate is mounted in the heat insulation shell base; the heating tank is mounted on the heating plate; the test tube stand is mounted on the heating tank; the temperature sensor is mounted in the heating tank; the integrated control device is mounted on the front surface of the heat insulation shell base; and the nitrogen blowing device is mounted above the heat insulation shell base. The nitrogen blowing concentrator is characterized in that the nitrogen blowing concentrator also comprises a double-column lifting device and a water level alarm device. The nitrogen blowing concentrator can automatically adjust the height of the nitrogen blowing device, is stable in operation and high in positioning accuracy, can carry out nitrogen blowing concentration or purification on mixed liquid to be concentrated or purified in multiple tubes and can prevent dry burning of the heating tank.