Turn-milling compounding machine body

A machine body of a turning and milling compound machine comprises a base, an upright post combined with the base in a sliding manner in a first direction, and a reversing unit forming an interlocking structure with the upright post. The reversing unit is provided with a first sliding seat which is combined with the base in a sliding manner in a second direction and a second sliding seat which is combined with the first sliding seat in a sliding manner in a third direction, so that the moving directions of the first and the second sliding seats are perpendicular to the holding direction of a workpiece. The special direction arrangement of the structure ensures that the upright post can directly equipped with the reversing unit and achieve the purpose of displacement in three directions, thereby decreasing volume, reducing occupied space, and improving the whole space benefits and transmission efficiency.