The present invention discloses a compound working head used in a multifunctional stone machining center, relating to mechanical equipment. The compound working head comprises working base parts, turning parts, and parts of carving and milling. The working head bases of the working base parts are of reversed L-shaped structures. The upper surfaces of the working head bases are connected with a journal bearing through a main support shaft. The journal bearing is positioned on a panel under a vertical sliding saddle mounted on the compound working head; inside surfaces of the side panels of the working head bases are connected with turning spindles of the turning parts. A carving and milling sliding saddle of parts of carving and milling is arranged on the outside of side panels of the working head bases, wherein feed shaft holes coordinated with positioning feed shafts and screws coordinated with nuts are arranged inside the carving and milling sliding saddle. An optical fiber test equipment is mounted between the main part of the carving and milling sliding saddle and the side panel of the compound working head base. The compound working head in the invention can not only realize rotation index of B-axis of the base and independent rotation index of C-axis of the carving and milling head, but also facilitate both the turning working and the carving and milling head to work independently without interference.