The utility model discloses a shield tunnel elastic gasket is water proofness verifying attachment when wrong platform volume of difference, this verifying attachment include a rigidity belt ribbed slab and four rigidity flat boards, wherein, rigidity belt ribbed slab comprises mainboard and a pair of floor, and a pair of floor staggers respectively and sets up the both sides in the mainboard waist, the volume of staggering of a pair of floor is elastic gasket's wrong platform volume promptly, wrong platform volume is 1mm-14mm. Shield tunnel elastic gasket is water proofness verifying attachment when wrong platform volume of difference is used in this application, has extended only to relate to the limitation of investigating elastic gasket and steel form contact surface permeance property among the current test method, can develop experimental study work with concrete contact surface permeance property to elastic gasket, has simulated the boundary condition of sealed pad in actual engineering better, and evaluating indicator is more objective with rationally, in addition, the verifying attachment of this application can use with present widely used common type concrete anti -permeability apparatus is supporting, has reduced the processing cost.