The invention discloses a method for producing sodium 2-hydroxy-6-naphthalene sulfonate. The method comprises the following steps: adding 118-120 kg of sodium hydroxide and 60 kg of water into an autoclave, stirring to dissolve, then adding 320-330 kg of sodium 2,6-naphthalene disulfonate with the content of 95%, and stirring uniformly; heating up to 230 DEG C, and holding for 8 hours; reducing the temperature of the solution in the autoclave to 95-100 DEG C, adding 600-610 kg of water, and hydrolyzing; and acidizing the solution with a 98% sulfuric acid until the pH value is 3-4, reducing the temperature to 25-30 DEG C, and centrifuging to obtain 307-309 kg of a sodium 2-hydroxy-6-naphthalene sulfonate crude product with the purity of 85.3%-88.8%. The method is simple in process, low in cost, and easy to operate.