Machining method for two sides of blade root of special-material large blade of steam turbine

The invention relates to the field of machining, in particular to a method for machining the two sides of a blade root of a special-material large blade of a steam turbine, and aims at solving the problems that in the machining mode that the blade root and a blade crown of the special large blade of the steam turbine are machined through a six-point positioning clamp, the size parameter angle needs to be noticed, and machining is difficult. According to the scheme, the clamp is placed on a numerical control horizontal machine tool platform, the blade is placed in the clamp, six-point positioning natural attachment is guaranteed, after the height of the auxiliary supporting device is adjusted to enable the supporting height of the auxiliary supporting device to meet the requirement, the pressing device is adjusted to press the blade root machining part, and then the clamping devices on the two sides of the blade crown are adjusted; meanwhile, it is guaranteed that after pressing, six-point positioning points o