The invention discloses an in-situ bone taking and grafting indication guide plate in horizontal bone augmentation and a manufacturing method thereof. The technical problems that in the prior art, bone grafting requirements cannot be met during bone taking, the surgical effect is influenced, adjacent important vascular nerves and other anatomical structures are damaged due to inaccurate positioning of bone taking, or surgical risks are increased due to additional trauma caused by excessive bone taking are solved. The indication guide plate comprises a base plate, a bone shell obtaining guide plate and a bone shell placing guide plate. The manufacturing method mainly comprises the steps that stl data are obtained through oral scanning before an operation, CBCT is shot to obtain Dicom data,the two data are registered and fused to carry out ideal dental crown three-dimensional position design to obtain an ideal gingival margin position of a tooth loss area, ideal implant position designis carried out with repair as guidance, therefore horizontal bone augmentation final outer surface design is guided, and the base plate, the bone shell obtaining guide plate and the bone shell placingguide plate are designed. The three-dimensional positions of bone taking and bone grafting sites are accurately indicated, surgical wounds are reduced, surgical risks are reduced, the surgical time is shortened, complications such as damage to tooth roots of adjacent teeth are avoided, and the surgical efficiency is improved.