The utility model discloses a feed port stepless regulation device of a vertical shaft impact crusher. The feed port stepless regulation device comprises an adjusting device arranged on the position of a feed port and used to control feed quantity. The adjusting device comprises adjusting rings, a track disc and control panels, wherein the adjusting rings are larger than the caliber of the feed port and the track disc and the control panels are sequentially stacked on the adjusting rings. Adjusting long grooves are arranged in the track disc in balanced mode, hinge pins fixed on the bottoms of a plurality of control panels and assembled on the track disc are fixedly connected with the adjusting rings after penetrating through the adjusting long grooves in the track disc, and the track disc is provided with limit stops of the control panels. One of the hinge pins horizontally extends outwards and is fixedly connected with an adjusting screw. The feed port stepless regulation device has the advantages of being simple in structure, stable to operate and capable of driving the adjusting rings to rotate to adjust the size of a square hole (the feed port) defined by enclosure of the control panels by screwing the adjusting screw, and can adjust feed quantity in stepless mode. If a cleaning rubber strip is arranged on the feed port, the cleaning rubber strip can prevent silver sand from blocking a sliding plate of a material control system, and material control and adjustment are convenient.