Water turbine seat ring machining device

The utility model discloses a water turbine seat ring machining device which comprises a supporting mechanism, a main shaft, a rotary driving mechanism and a machining cutter mechanism. The supporting mechanism comprises an upper supporting tool and a lower supporting tool. The main shaft is mounted on the upper supporting tool and the lower supporting tool; the rotary driving mechanism is used for driving the spindle to rotate; the machining cutter mechanism comprises at least two or more cutter arm pieces and at least two or more machining cutter rest assemblies, each cutter arm piece comprises a cutter arm body and a balance weight arm body which extend transversely, the cutter arm bodies and the balance weight arm bodies are perpendicularly connected with the main shaft, and the cutter arm bodies and the balance weight arm bodies are arranged on the same transverse straight line. The machining tool rest assemblies are installed on the machining ends in a one-to-one correspondence mode, the multiple machin