The invention discloses a device for producing rich oxygen and high-pressure and high-purity nitrogen by using a heat pump technology. The device comprises an air compression system, a precooling purification system, an expander, a water cooler and a cold box; the air compression system comprises an air compressor and an air supercharger; a main heat exchanger, a subcooler, a liquid oxygen pump, aliquid nitrogen pump, a rectifying tower and a pure nitrogen tower are arranged in the cold box; the rectifying tower comprises a lower tower and an upper tower; a condensation evaporator is arrangedbetween the upper tower and the lower tower; an evaporator is arranged at the bottom in the pure nitrogen tower; and a condenser is arranged at the top in the pure nitrogen tower. The device aims toovercome such problems as excessive rectification of nitrogen of the lower tower and need of a nitrogen compressor by high-pressure nitrogen in the prior art; and the heat pump technology is used forproviding the device and the method, which are low in energy consumption, investment and floor area, are economical and reasonable and obtain the rich oxygen and high-pressure and high-purity nitrogenthrough cryogenic separation.