Large-helical-angle indexable turning tool bar

The invention provides a large-helical-angle indexable turning tool bar. The large-helical-angle indexable turning tool bar comprises a mounting seat, a fixed shaft, a shaft sleeve and a fastening mechanism; a first mounting through groove and a second mounting through groove are formed in the mounting seat; the first mounting through groove and the second mounting through groove penetrate throughthe left side surface and the right side surface of the mounting seat; fixing holes are formed in the front side surface and the upper surface of the mounting seat, fixing holes are formed in the rear side surface and the upper surface of the mounting seat, and a compression screw is arranged in each fixing hole; the shaft sleeve comprises a transversely-arranged shaft sleeve body; a shaft hole with the inner diameter matched with the outer diameter of the fixed shaft is formed in the center of the shaft sleeve body; a transverse clamping through groove is formed in the front surface of the shaft sleeve body; and one