Compound machine for machining crankcases

The utility model belongs to the technical field of mechanical equipment, relates to a machine tool, and in particular relates to a compound machine for machining crankcases which is used for solving the technical problem that the design of the prior art is not reasonable enough. The compound machine comprises a rack, wherein a workbench is arranged on the rack; a positioning component for fixing a workpiece is arranged on the workbench; a plurality of power heads which are used for clamping tools and are arranged abreast are arranged on the positioning component; each power head is connected with a power mechanism which can drive the power head to go up and down and rotate; the power mechanisms are fixed on the workbench; and a horizontal moving device which can drive the positioning component to move along the abreast arrangement direction of the power heads is also arranged on the workbench. Compared with the prior art, the compound machine has the advantages of being reasonable in design and simple in str