The utility model discloses a shield tunnel elastic gasket " twice are waterproof " water proofness verifying attachment, this verifying attachment include a rigidity belt ribbed slab and four rigidity flat boards, wherein, rigidity belt ribbed slab comprises mainboard and two pairs of floors, and two pairs of floors symmetry respectively set up in the both sides of mainboard waist. Shield tunnel elastic gasket " twice are waterproof " water proofness verifying attachment 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, can comparatively accurately simulate the waterproof performance who uses twice waterproof gasket structure in the engineering, 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.