The Bosman gantry type composite three sided CNC boring and milling machine 8088 is a specialized machine tool equipment for three sided machining of workpieces in the construction machinery industry. The machine tool adopts a dedicated bed, a mobile worktable, and a fixed gantry structure. The left and right columns of the fixed gantry are equipped with horizontal sliding pillows, and the crossbeam of the fixed gantry is equipped with vertical sliding pillows and spindles. The left and right horizontal sliding spindles can work simultaneously or independently, and a set of vertical sliding pillows and spindles can independently process workpieces. It can perform drilling, milling, boring and other machining on the workpiece within the effective travel range, and the workpiece can be machined to the desired position in one go (without the need for secondary clamping).