The invention provides a clean production technology and method for lithium sulfate. A technique and a roasting additive are used. The production process comprises the steps of sieving, mixing, granulating, roasting, soaking, impurity deposition, crystalizing, drying and the like, and the roasting additive comprises components including Na2SO4, K2SO4, CaCO3, CaO and the like. By the clean production technology and method for lithium sulfate, the roasting conversion rate and leaching rate of lithium can be increased, moreover, acid is not used, types and contents of impurities in leaching liquid are less, a follow-up impurity removal process is simple, and acid and alkali consumption is low. The production process is simple, the lithium extracting rate is high, energy and materials are reused, and thus, the clean production technology and method are suitable for large-scale production.