The invention relates to a desulfuration, denitration and calcium sulfate whisker coproduction process for NOx recovery. The process comprises the steps of absorbing SO2 and NOx from flue gas in an absorption column by a formulated absorbent, then, recovering NOx through analysis, preparing calcium sulfite whiskers from SO2 through reaction, further preparing anhydrous calcium sulfate whiskers, and regenerating the absorption solution through electrolysis. The process has the beneficial effects that the problem of recycling of NOx is solved, and the recovery ratio is not lower than 85%; and a denitration process becomes a process for producing high-added-value products such as nitric acid and the like, direct current consumed by an electrolyzer is reduced, and the quality of the byproduct anhydrous calcium sulfate whiskers is higher.