The invention discloses a single fracture unsaturated seepage test system which comprises a constant head water supplying system, two blocks of strip-shaped stone, two gaskets, a support and a data acquisition system, wherein the constant head water supplying system is used for providing water for experiment and ensuring constant pressure in a water inlet, the two blocks of strip-shaped stone are stacked together, grains of sand are evenly adhered on two opposite surfaces, the gaskets are in a long and thin shape and placed at two sides of a long side between the two blocks of strip-shaped stone, the support is used for fixing the strip-shaped stone, the data acquisition system comprises a current location detection circuit and an industrial personal computer in connection, the current location detection circuit is provided with a plurality of monitoring points in stone cracks, times of current flowing to each monitoring point are monitored by the industrial personal computer, and monitoring of current location in the stone cracks is achieved. The single fracture unsaturated seepage test system has the advantages of changing the height of water head, the thickness of the stone cracks, the roughness of the surfaces of the stone cracks of the constant head water supplying system, monitoring and recording the times of the current flowing to some locations, and achieving a fluid flowing law experimental research in the unsteady process of the current in the horizontal dry cracks from nonexistence to pass into existence.