The invention discloses a method for preparing 1,2,3,4-tetrahydro-1-naphthoic acid by using a superstrong alkali method. The method comprises the following steps: (1) under the protection of nitrogen,preparing a hydrogen drawing product by using tetrahydronaphthalene as a raw material, adding potassium tert-butoxide, using n-hexane as a solvent and dropwisely adding n-butyllithium; and (2) underthe protection of nitrogen, introducing dry carbon dioxide into the system, and acidifying to obtain the target product, wherein in the step (1), a molar ratio of potassium tert-butoxide to n-butyllithium is 1:(0.5-1.5), preferably 1:1.0, and preferably in the step (1), a molar ratio of the superstrong alkali to the tetrahydronaphthalene is 1:(0.5-2), preferably 1:(1.2-1.5). Compared with the method in the prior art, the method of the invention has the advantages of short steps, cheap raw materials, high yield, high operability, good repeatability and convenience in industrialization.