The invention discloses a milling method of a blade of a high-temperature alloy whole blade ring. The method comprises following steps: firstly, a manufacturing procedure is selected, and the milling technology path of the whole blade ring comprises air inlet end rough milling slotting, exhaust end rough milling slotting, air inlet end blade type and flow way accurate milling and exhaust end blade type and flow way accurate milling; secondly, according to the length and the maximum thickness of the blade of the whole blade ring blade type, the machining allowance reserved for accurate milling after rough milling slotting is determined; thirdly, a tool is selected, wherein during rough milling, an end milling cutter of phi 6R0.5 to phi 6R1.5 is selected for machining, and during accurate milling, a taper ball head milling cutter with the shrinking neck is selected for machining; fourthly, cutting parameters are selected; fifthly, the accurate milling step is selected. Machining of the blade of the high-temperature alloy blade ring part is effectively achieved, the method can ensure that the machined part has the good surface quality and meets the design required form and location tolerance, and the method also can be applied to milling of complex curve deep cavities.