The invention belongs to the technical field of mechanical cutting tools, and particularly relates to a TiSiTaN coated cutting tool and a manufacturing method thereof. A matrix of the cutting tool ismade of hard alloy or high-speed steel, and the cutting tool is manufactured by adopting a multi-arc ion plating method and a mid-frequency magnetron sputtering method. The TiSiTaN coated cutting tooladopts a multi-layer structure. A TiSiTaN coating is arranged on the surface of the cutting tool. A TiSiN, TiN and Ti transition layer is arranged between the TiSiTaN layer and the matrix. The TiSiTaN coating on the surface of the cutting tool has very high hardness and strength, a Ta element can improve the toughness of the coating, and the oxidation resistance and the thermal stability of the coating can be improved. In the cutting process, the TiSiTaN coating can effectively improve the oxidation resistance and the wear resistance of the cutting tool, so that the life of the cutting tool is prolonged. The TiSiTaN coated cutting tool can be widely applied to dry cutting and cutting of materials difficult to process.