Double-spindle box structure with four-spindle machining center

The invention discloses the technical field of machining equipment, and particularly relates to a double-spindle box structure with a four-spindle machining center. The double-spindle box structure comprises a base, the base is fixedly connected with a standing column, a cross beam crossing the base is arranged on the standing column, a working table reciprocating in the X-axis direction is slidably installed on the base, the working table is located on the lower part of the cross beam, a sliding seat reciprocating in the Y-axis direction is slidably installed on the cross beam, one or more pairs of spindle boxes reciprocating in the Z-axis direction are oppositely arranged on the two sides of the sliding seat, the cross section of the spindle boxes is in a waist circle shape, the spindleboxes are tightly and slidably connected to the sliding seat and thus the distance between the spindle boxes and the sliding seat approaches zero, the spindle boxes comprise a plurality of spindles, and detachable cutters are installed at the bottom ends of the spindles correspondingly. Design of the waist circular spindle boxes is adopted, the size of the spindles from the side face of the sliding seat is decreased, the distance between the end faces of the spindles and the side face of the sliding seat is decreased, it is ensured that stress of workpieces during machining is more stable, theprecision is higher, and the roughness is better.