A device for continuously impregnating a cloth material with a dye solution or a resin liquid or the like. The device includes a tubular cloth material passage measuring at least 400 mm in length and has an opening which is slightly wider than the breadth of the cloth material in transverse width and measures about 3 mm in longitudinal width. A liquid supply mechanism adjoins the cloth material inlet of the cloth material passage; and wringer rolls are provided in the vicinity of the outlet of the cloth material passage. Within the liquid supply mechanism, a pair of weir plates is provided each of which is disposed on an opposite side of the cloth material passing through the liquid supply mechanism. The weir plates are arranged to permit the adjustment of the gap between them for allowing the cloth material to pass therethrough.