The invention discloses a waterproof method of a buried water stopper for bonding a building deformation joint, which comprises the steps that: two dovetail groove models which are made from foamed rubbers are respectively adhered to the two sides of a deformation joint pattern plate; concrete is respectively poured into the spaces of the two sides of the deformation joint pattern plate; the deformation joint pattern plate is removed, the dovetail groove models are taken out, two corresponding dovetail grooves are formed at the two sides of the deformation joint, and the openings of the dovetail grooves face the deformation joint; adhesive is filled in the two dovetail grooves; and the two ends of the buried water stopper are placed in the two corresponding dovetail grooves, and are adhered to the inner sides of the two dovetail grooves. After the waterproof method is adopted, no gap is left between the concrete and the buried water stopper, so the waterproofness is reliable; and the construction technology gets simpler, and the cost is reduced.