Disclosed is a seepage and internal erosion test apparatus for geotechnical centrifuges. The apparatus includes a mounting base, a four-motorized-jack synchronized lifting table fixed onto the mounting base, a downstream water sink, a plurality of permeameters, a centrifugal pump, and an upstream water sink fixedly mounted on the four-motorized-jack synchronized lifting table; the downstream water sink, the plurality of permeameters, the centrifugal pump, and the upstream water sink are connected by means of pipes; electric ball valves are separately disposed on each branch on which the permeameter is mounted; a temperature control module and flow meters are disposed of in the pipe for connecting the upstream outlet to the permeameter water inlet.