Abstract: The present invention relates to the technical field of bone processing, and in particular to a composite device for autologous bone harvesting and bone processing, including: a bone harvesting auxiliary device and a bone processing device. The bone harvesting auxiliary device includes: a bone harvesting caliper, a guide sleeve, and a depth-limiting Kirschner wire. The bone processing device includes: a bone box, a fastening assembly, and a cutting assembly. The composite device for autologous bone harvesting and bone processing in the present invention is capable of precise harvesting based on preoperative imaging measurements, thereby preventing resource waste. Intraoperatively, the device can obtain cancellous bone, unicortical bone, bicortical bone, and tricortical bone. In addition, various finished bone products of different shapes and sizes can be prepared according to requirements for a bone grafting area, such as bone granules, bone strips, bone chips, and bone blocks.