The invention aims to provide a four-axis linkage type computer numerical control machining center and a working method thereof. According to the technical scheme, the four-axis linkage type computernumerical control machining center is composed of a machining cabin, a tool bearing frame, a tool controller, a tool changing machine, a tool changing control table, a machining control cabinet and amachining mechanism, wherein the machine mechanism is composed of a machining bearing table, a Y-axis moving rail table, a Y-axis moving frame, an X-axis moving supporting table, an X-axis moving railtable, a Z-axis machining mechanism, a telescopic machine and a plurality of material bearing fixing frames, and the machining bearing table is composed of a waste material collecting tank, a waste material overturning device and a waste material recovering plate. According to the four-axis linkage type computer numerical control machining center, tool changing operation and machining operation form two independent control units so that misoperation caused by a single control unit is avoided, maintenance and overhaul are facilitated, then four-axis linkage type computer numerical control machining is more accurate, material fixing and position adjusting can be realized through the plurality of material bearing fixing frames, waste materials obtained after machining can be concentrated, sothat the internal operation environment of a machining space is guaranteed, and the quality of machined products is improved.