Abstract: Aiming at the difficulties in the machining of additively manufactured products with special-shaped structures for current spacecraft, this paper proposes an integrated rapid machining technology of "clamping-scanning-fitting-programming-machining" by combining the principles of reverse engineering. A clamping scheme that combines adhesive fixing and auxiliary support is adopted to achieve stress-free fixing of products; a positioning tooling suitable for clamping additively manufactured products with special-shaped structures is designed to realize rapid clamping and alignment; point cloud data is obtained through scanning, and reverse fitting is conducted to construct the design model, thereby achieving the unification of virtual datums; high-precision allowance compensation for CNC programs is realized by combining product deformation analysis and allowance analysis. Finally, rapid machining of additively manufactured products with special-shaped structures without repeated alignment is achieved. Practical machining verification shows that for a typical additively manufactured special-shaped bracket, the positioning error is better than 0.08 mm, and the production efficiency is increased by 186%.