A denture preparation kit comprising: a maxillary standard denture; a mandibular standard denture; and a standard denture alignment jig (102, 103, 104, 105, 106) configured to guide the maxillary standard denture and the mandibular standard denture to an oral cavity or an articulator to which maxillary and mandibular edentulous jaw models are fixed and configured to align positions of the maxillary standard denture and the mandibular standard denture in the oral cavity or in the articulator to which the maxillary and mandibular edentulous jaw models are fixed, wherein the standard denture alignment jig (102, 103, 104, 105, 106) comprises a standard denture retention unit including a maxillary standard denture retention groove and a mandibular standard denture retention groove and comprises a handle connected to the standard denture retention unit, wherein the maxillary standard denture retention groove and the mandibular standard denture retention groove are configured to retain the maxillary standard denture and the mandibular standard denture while maintaining occlusion between the maxillary standard denture and the mandibular standard denture, and the handle functions as a horizontal guide, when being used, and has a flat plate shape having a plane parallel to an occlusal plane between the maxillary standard denture and the mandibular standard denture retained by the standard denture retention unit, and the handle has a lower surface coplanar with an incisal edge of a maxillary anterior tooth of the maxillary standard denture, wherein the handle includes a median guide indicating a median position of a central incisor of the maxillary standard denture and the mandibular standard denture retained by the standard denture retention unit. a maxillary standard denture; a mandibular standard denture; and a standard denture alignment jig (102, 103, 104, 105, 106) configured to guide the maxillary standard denture and the mandibular standard denture to an oral cavity or an articulator to which maxillary and mandibular edentulous jaw models are fixed and configured to align positions of the maxillary standard denture and the mandibular standard denture in the oral cavity or in the articulator to which the maxillary and mandibular edentulous jaw models are fixed, wherein the standard denture alignment jig (102, 103, 104, 105, 106) comprises a standard denture retention unit including a maxillary standard denture retention groove and a mandibular standard denture retention groove and comprises a handle connected to the standard denture retention unit, wherein the maxillary standard denture retention groove and the mandibular standard denture retention groove are configured to retain the maxillary standard denture and the mandibular standard denture while maintaining occlusion between the maxillary standard denture and the mandibular standard denture, and the handle functions as a horizontal guide, when being used, and has a flat plate shape having a plane parallel to an occlusal plane between the maxillary standard denture and the mandibular standard denture retained by the standard denture retention unit, and the handle has a lower surface coplanar with an incisal edge of a maxillary anterior tooth of the maxillary standard denture, wherein the handle includes a median guide indicating a median position of a central incisor of the maxillary standard denture and the mandibular standard denture retained by the standard denture retention unit.