Horizontal machining center machine tool capable of rapidly changing tool

The utility model discloses a horizontal machining center machine tool capable of quickly changing tools, which comprises a bottom plate, a base is fixedly connected to the bottom of the bottom plate, a shell is fixedly connected to the top of the bottom plate, a mainframe box is movably mounted at the position, close to one side, of the bottom in the shell, a main shaft is fixedly mounted on one side of the mainframe box, and the main shaft is fixedly mounted on the other side of the mainframe box. A clamping groove is formed in the position, close to the center, of one side of the main shaft. According to the horizontal machining center machine tool capable of rapidly changing the tool, through the design of a clamping groove, a limiting groove, a limiting plate, a clamping rod and a mounting bolt, the tool bit changing speed of a user can be effectively increased, so that the working efficiency is improved, meanwhile, the fixing effect of tool bit mounting can be effectively improved in a threaded connecti