The invention discloses a fixed column type double-spindle double-workbench horizontal machining center. The fixed column type double-spindle double-workbench horizontal machining center comprises a base, an X-axis guide rail is arranged on the base, a saddle is arranged on the X-axis guide rail, and a first Z-axis guide rail and a second Z-axis guide rail are arranged at the two ends of the saddle respectively; a first numerical control rotary table is arranged on the first Z-axis guide rail in a sliding mode, a second numerical control rotary table is arranged on the second Z-axis guide railin a sliding mode, a stand column is arranged at one end of the base, a Y-axis guide rail is arranged on one side, close to the base, of the stand column, and a main spindle box is arranged on the stand column. Two main spindles simultaneously machine a workpiece on the two rotary tables, so that the efficiency is improved in a multiplied mode; the two workbenches are independent from each otherin the Z-axis direction and can move synchronously and independently as well, the use is more convenient; the occupied area is small, and an occupied area is close to the occupied area of a single-spindle machine type with the same specification; and the stability is higher, and the manufacturing cost is far lower than the manufacturing cost of two existing horizontal machining centers.