Method and device for synchronously machining space curved surface in additive and subtractive double-station mode

The invention discloses an additive and subtractive double-station device for synchronously machining a space curved surface. The device comprises a fixed base, a first stand column, an additive module, a grinding and cutting module and the like. The gantry crane cross beam can move up and down relative to the gantry crane stand column and can rotate relative to the inner base; the lower moving table can horizontally move relative to the lower moving table, the upper moving table can horizontally move relative to the inner base, and the moving direction of the upper moving table is perpendicular to that of the lower moving table. The material adding module and the grinding and cutting module can synchronously and horizontally move relative to the gantry crane cross beam; the at least two first stand columns are arranged on the outer sides of the two ends of the workbench respectively and fixed to the composite moving platform, and the workbench can incline relative to the first stand columns. The invention ha