The invention relates to a technological method for recycling high-salinity wastewater from sodium carbonate manufacturing factories. The technological method includes steps of (1), adding concentrated sulfuric acid into the wastewater according to a ratio of the molar concentration of CaCl2 in the wastewater to the molar concentration of sulfuric acid, generating CaSO4 precipitates and hydrochloric acid, depositing the CaSO4 precipitates at the bottom of a reactor under the effect of gravity, discharging the CaSO4 precipitates into a precipitate storage tank and allowing upper aqueous solution to flow into an acid-resistant water storage tank; (2), further dehydrating the CaSO4 precipitates stored in the precipitate storage tank by means of centrifugal separation, storing centrifuged cake residues for standby application and allowing centrifuged aqueous solution to flow into the acid-resistant water storage tank; (3), preparing concentrated sulfuric acid from the CaSO4 cake residues by the aid of calcining processes, simultaneously obtaining quicklime CaO and allowing the concentrated sulfuric acid to be reused at the step (1) so as to circulate the concentrated sulfuric acid in a closed-loop manner; (4), removing the hydrochloric acid in the acid solution in the acid-resistant water storage tank by the aid of distillation or membrane absorption processes to obtain concentrated brine mainly with NaCl and reusing the concentrated brine with the NaCl in soda manufacturing technological procedures. The ratio of the molar concentration of the CaCl2 in the wastewater to the molar concentration of the sulfuric acid is 1:1. The concentrated brine can be reused as a raw material in the soda manufacturing technological procedures.