The invention provides a water circulating sand tank test device for a confined water seepage model, wherein an infiltration water channel is connected with a sand tank through a connector; an infiltration partition plate is inserted and fixed into a groove in the connector; the surface of the infiltration partition plate is coated with a first anti-seepage curtain; a seepage water channel is connected with the sand tank through the connector; a seepage partition plate is inserted into the groove in the connector; the surface of the seepage partition plate is coated with a second anti-seepage curtain; the upper part of the sand tank is covered with a top cover plate through waterproof glue; two ends of the sand tank are connected with the infiltration partition plate and the seepage partition plate through the waterproof glue; a plurality of piezometer tubes are arranged on the side wall of the sand tank; and a support structure is arranged on the lower surface of the whole structure. The water circulating sand tank test device has the beneficial effects of being simple in structure and high in operability, is capable of simulating stable and unstable seepage processes of confined water and pumping seepage processes of a complete well and an incomplete well of the confined water and plays an important role in research of seepage characteristic in the confined water and seepage stability analysis, and a good experiment device scheme is provided for experiment research of more problems in related professional fields.