The invention relates to a ship propeller machining special machine tool. The machine tool comprises an operation base, a chip removal device, a propeller rough machining device, a propeller finish machining device, a propeller installing and positioning device and a machine tool driving device, wherein the middle of the operation base is provided with a pit used for placing a to-be-machined propeller, the propeller installing and positioning device is arranged in the pit, the machine tool driving device is arranged around the propeller installing and positioning device, the two ends of the machine tool driving device are provided with the propeller rough machining device for propeller machining and the propeller finish machining device for propeller machining correspondingly, and the rough machining device and the finish machining device can perform rough machining and finish machining on a blade root and a propeller hub of the propeller at the same time. According to the machine tool, the two machining devices are adopted to be symmetrically arranged, a vertical machining method is adopted for the blade root and the propeller hub of the propeller, the two machining devices can perform rough machining and finish machining at the same time, the machining efficiency is greatly improved, and rough and finish machining integration is achieved.