The invention provides an automatic spraying support protection fixture for turbine guide vanes. The automatic spraying support protection fixture is characterized by comprising a base (1), a supporting plate (2), a positioning block (3), a lower baffle (4) and an upper baffle (5). The supporting plate (2) is perpendicularly installed on the base (1), and the top end of the supporting plate (2) is provided with a plane; the positioning block (3) is of a V-shaped plate structure with a forward opening and is used for installing the guide vanes, the bottom surface of the positioning block (3) is installed on the plane of the top end of the supporting plate (2) through bolts, an opening installation surface of the positioning block (3) is matched with installation edges of the vane back sides of lower edge plates of the guide vanes in shape, and the upper edge of the positioning block (3) is flush with the spraying end faces of the lower edge plates of the guide vanes; the lower baffle (4) is of a V-shaped plate structure with a backward opening, an opening part installation surface of the lower baffle (4) is matched with the vane basin sides of the lower edge plates of the guide vanes in shape, and the upper edge of the lower baffle (4) is flush with the spraying end faces of the lower edge plates of the guide vanes.