The invention provides high-purity nitrogen equipment which comprises a preprocessing system, a purifying system and a fractionating tower, wherein the fractionating tower comprises a turboexpander, a main heat exchanger and a subcooler for heat exchange, a rectifying tower and a condensation evaporator, the rectifying tower comprises an upper tower and a lower tower, the outlet of the purifying system is connected with the air inlet of the lower tower through a pipeline, and the pipeline passes through the main heat exchanger; the lower tower is also provided with an oxygen-enriched liquid air outlet for oxygen-enriched liquid air generated by rectification to flow out, the oxygen-enriched liquid air outlet is connected with the purifying system through a pipeline, and the pipeline passes through the main heat exchanger; and the upper tower is provided with a nitrogen gas outlet, and the pipeline connected with the outlet passes through the main heat exchanger. In the invention, the pipeline of enriched oxygen, the pipeline of raw material air and the pipeline of nitrogen gas are simultaneously connected with the main heat exchanger, so that the cold quantities of the enriched oxygen and the nitrogen gas are fully utilized, and the high-purity nitrogen equipment saves the energy and protects the environment; meanwhile, the enriched oxygen is sent into the expander for refrigeration, and the high-purity nitrogen equipment has the advantages of reasonable structure, material saving and simple flow configuration.