The invention discloses tools for grafting with a fine variety of a big tree and an application method thereof. The tools comprise a grafting rootstock peeling tool, a grafting branch scion shaping tool and a branch pruning tool, wherein the grafting rootstock peeling tool comprises a first base plate which is fixedly welded with a first cutting blade; the grafting branch scion shaping tool comprises a second base plate which is fixedly welded with a second cutting blade; one end of the second cutting blade is integrally provided with an extension blade; and the branch pruning tool comprises asleeve and an extension part which are integrally molded. The tools provided by the invention have the advantages of simple structure, low production cost and convenient popularization and application; through the grafting rootstock peeling tool and the grafting branch scion shaping tool, a rootstock and a scion with same insection can be manufactured, so the scion is closely attached to the rootstock; phloem is smooth and matches exactly, so a callus can be easily formed, and high survival rate is achieved; and the time of manufacturing the rootstock and the scion is saved, and the quality of grafting is improved.