The invention relates to a special automatic feeding machine for communication cable laying construction. The special automatic feeding machine comprises a bottom plate, wherein an operating vertical plate is mounted on the upper end plane of the bottom plate; a driving motor is mounted on the side wall of the operating vertical plate through a motor seat; a fixed circular plate is mounted on the output shaft of the driving motor; clamping mechanical arms are uniformly mounted on the outer wall of the fixed circular plate in an axis direction; the driving motor drives the fixed circular plate to turn, and the fixed circular plate drives the uniformly and annularly-arranged clamping mechanical arms to slowly rotate; an extrusion mechanism is mounted on the middle part of the upper end plane of the bottom plate; the front end plane of the extrusion mechanism props against the inner walls of the three clamping mechanical arms at the lowest end of the fixed circular plate; existing communication cables are clamped in the three clamping mechanical arms at the lowest end of the fixed circular plate; and the three clamping mechanical arms at the lowest end of the fixed circular plate are extruded by the extrusion mechanism. The special automatic feeding machine can realize automatic clamping and feeding auxiliary functions for cables.