The invention discloses a manufacturing process of a high-temperature alloy turbine, wherein the manufacturing process includes following steps: (1) melting middle-temperature wax in a standing barrel, allowing the middle-temperature wax to stand at 95-98 DEG C, removing bubbles from the wax, and maintaining the temperature in the standing barrel for later use; (2) performing injection moulding to a wax die, wherein the wax injection temperature is 50-55 DEG C, the wax injection time is 40-50 s, and the pressure is 48-55 kg/cm<2>; (3) performing tree-combination to the injection-moulded wax dies and a die head, wherein each tree set includes three wax dies; (4) performing material coating, sand adhesion, drying and dewaxing to the tree-combined wax dies to obtain a die shell; and (5) high-temperature roasting the die shell, adding a mother alloy, vacuumizing the die shell and melting and casting the alloy; and (6) finally detaching the die shell, cleaning the alloy turbine, and performing inspection to the alloy turbine and storing the alloy turbine in storerooms. In the tree-combination steps, one die head is combined with three wax dies to form a tree set, so that compared with a conventional tree-combination operation in which one die head is combined with one wax die, the manufacturing process greatly improves the raw material utilization rate and production efficiency and increases the yield of the products.