Disclosed is a method of removing an inorganic salt in sulfonate; the method comprises the following steps: neutralizing sulfonated acidic oil with a neutralizing agent aqueous solution until the pH value is 7-8, and separating out the neutralized sulfonate aqueous solution; adding a water carrying agent, carrying out a dehydration operation, and dehydrating the sulfonate aqueous solution to the water content of less than 1 wt%; cooling the sulfonate after dehydration to 40 DEG C-100 DEG C, taking a physical adsorbent according to 0.1 wt%-5 wt% of the sulfonate, adding the physical adsorbent into the sulfonate after dehydration, and carrying out heat preservation stirring for 1-30 minutes, to obtain an adsorbent-containing sulfonate mixture; filtering the adsorbent-containing sulfonate mixture to obtain sulfonate, and testing the content of the inorganic salt in the sulfonate; and if the content of the inorganic salt is greater than or equal to 0.5 wt%, repeatedly filtering until the content of the inorganic salt in the sulfonate is less than 0.5 wt%. The higher efficacies of effective components in the sulfonate can be achieved.