The invention discloses a graphite matrix flawless TaC coating and a manufacturing method thereof. A tie coat is deposited on a graphite matrix. A TaC main coating is deposited on the outer layer of the tie coat. The tie coat is composed of a SiC-TaC codeposition coating or compounded by two transition layers of the SiC-TaC codeposition coating and a SiC-TaC laminated coating. When the tie coat is compounded by two transition layers of the SiC-TaC codeposition coating and the SiC-TaC laminated coating, the SiC-TaC codeposition coating serves as a first transition layer, and the SiC-TaC laminated coating serves as a second transition layer; and then the deposition of the tie coat is ended; or the SiC-TaC codeposition coating and the SiC-TaC laminated coating are alternatively deposited many times. Good TaC coating which has small heat stress, no macroscopic cracking, corrosion-resistance, and good thermal stability is deposited out of the surface of the graphite material. The method is suitable for preparing graphite substrate, graphite crucible, graphite windpipe, graphite guide shell coating in the crystal and semiconductor production, protecting and cleaning coating such as antisepsis, anti-pollution, anti-infiltration, anti-oxidation of graphite parts in other various hot environments.