The utility model relates to a nitrogen transform adsorbing equipment, which is mainly and technically characterized in that a middle pressure equalizing pipeline is arranged between two adsorption towers and connected with an emptying valve and a muffler; the middle pressure equalizing pipeline is formed by that the emptying valve is connected with the middle parts of two pressure equalizing valves; the middle pressure equalizing pipeline makes the air with the relative high purity at the middle parts of the adsorbing towers enter into the bottom of a desorbing tower by using the different pressures of the two adsorbing towers and the different adsorbing areas of the molecular sieves of the adsorbing towers, the desorbing tower pre-adsorbs firstly, and then the upper and the lower pressure equalizing are performed, the procedure is switched, so the nitrogen with high purity is extracted, the nitrogen reclaim and the use of the carbon molecular sieves are improved.