Concrete anti-permeability instrument

The utility model relates to a concrete impermeability instrument, and relates to the technical field of concrete detection equipment, the concrete impermeability instrument comprises a workbench, the workbench is fixedly provided with a base, the middle of the base is provided with a water outlet, the base is provided with a circle of groove, the groove is internally provided with a protruding rubber sealing ring, a test block sleeve is arranged above the base, and the test block sleeve is provided with a water inlet. A circle of lower mounting ring is fixedly arranged at the top of the base, a circle of upper mounting ring matched with the lower mounting ring is fixedly arranged at the bottom of the test block sleeve, the upper mounting ring and the lower mounting ring are sleeved with a hoop, and inward annular sealing edges are arranged on the upper side and the lower side of the hoop; and the distance between the two annular sealing edges is set to be the same as the sum of the thicknesses of the upper m