The invention discloses a double-spindle numerical control horizontal lathe which comprises a base. A body and a motor connecting plate are respectively symmetrically arranged at the left end and the right end of the base, two guide rails are arranged on each body and include a rectangular guide rail and a mountain-shaped guide rail, saddles are mounted on the guide rails and driven to longitudinally move along the guide rails by Z-directional transmission lead screws mounted between the guide rails, dovetail guide rails are arranged on the saddles, X-directional transmission lead screws are mounted between the dovetail guide rails and drive middle sliding plates on the dovetail guide rails to transversely move along the dovetail guide rails, T-shaped groove tool rest plates are arranged on the middle sliding plates, a spindle servo motor is mounted on each motor connecting plate, and a driving pulley is mounted on an output shaft of each spindle servo motor and drives a driven pulley mounted at one end of a spindle box on each body through a belt. Two traditional machine tools are combined, parts are machined by one machine tool, so that labor intensity is reduced, and production efficiency is improved.