The invention provides a special double-spindle numerical-control boring machine high in precision and efficiency. The special double-spindle numerical-control boring machine comprises a body. A bench is disposed in the middle of the body, carriages are disposed on left and right sides of the body respectively, positioning clamping devices are symmetrically mounted at left and right ends of the top of the bench respectively, a boring power head is mounted above each carriage, two boring tools are mounted on each boring power head, each carriage is connected to the body through a driving device, a guard covering the whole body is disposed above the body, the middle of the guard is provided with a sliding door driven by an air cylinder, each boring tool is provided with at least one group of tool bits, and an automatic scrap discharger, an air pump device, an oil pump device and a cooling pump device are rested on the back of the body. The special double-spindle numerical-control boring machine is provided with the two boring power heads in bilateral symmetry for machining two workpieces simultaneously, each boring power head is provided with two boring tools for machining two holes of each workpiece simultaneously, and the efficiency of the special double-spindle numerical-control boring machine is ten times of that of the common boring machine. The special double-spindle numerical-control boring machine is provided with the guard and the automatic scrap discharger, the whole machining process is under control of a control cabinet, and the machining environment is closed and neat.