The invention relates to a three-foot type centrifugal machine automatic feeding device, belongs to solid-liquid separation devices, and mainly solves feeding problems of existing three-foot type centrifugal machines. The three-foot type centrifugal machine automatic feeding device comprises a centrifugal machine shell with an open top and is characterized in that the upper portion of the centrifugal machine shell is open and provided with a lower hook, a cone-shaped cover is arranged above the open upper portion of the centrifugal machine shell, the lower side of the cone-shaped cover is provided with an upper hook and matched with the lower hook in hooked mode, a feeding soft pipe controlled by a feeding valve penetrates through the cone-shaped cover, and the top of the cone-shaped cover is provided with an elastic rope. The three-foot type centrifugal machine automatic feeding device can lower labor intensity of workers and simultaneously reduce material loss and surrounding pollution.