The invention provides a regeneration method for a physical masking-inactivated SCR denitration catalyst. The method comprises the following steps: 1) carrying out dedusting treatment; 2) putting a regeneration liquid into cleaning equipment for pretreatment; 3) putting a dedusted nactivated SCR denitration catalyst module into the cleaning equipment for cleaning; 4) carrying out drying; and 5) carrying out calcining and cooling so as to obtain a finished product. The regeneration liquid used in the regeneration method for the physical masking-inactivated SCR denitration catalyst comprises the following components by weight: one or more selected from the group consisting of 0.1 to 2% of an emulsifier, 0.1 to 2% of an osmotic agent and 0.1 to 5% of a complexing agent, with the balance being deionized water. Compared with the prior art, the regeneration method and regeneration liquid provided by the invention have the characteristics of substantial regeneration effect, low cost, good operationality, easiness in operation and neglectable damage to the catalyst module.