Draining device of foundation pit support surface aquitard

The utility model relates to a draining device of a foundation pit support surface aquitard, which comprises a support surface. Aquitard soil is arranged on the outer side of the support surface, at least one drain pipe is disposed in the support surface, one part of the drain pipe is located in the aquitard soil on the outer side of the support surface, and the other part of the drain pipe is exposed on the inner side of the support surface. Water seepage through-holes are arranged around the drain pipe on the side of the aquitard, the outer side of the seepage through holes of the drain pipe is wrapped by a filter screen, space is reserved between the filter screen and the aquitard soil, and the space is filled with filter materials. The draining device of the foundation pit support surface aquitard has the advantages that, by means of the good effect of the drain pipe on removing water in an aquitard, not only water in soil mass flows into the drain pipe through the water seepage through-holes and then is discharged through the drain pipe, but also solid particles in the soil mass which are discharged with water flow during water discharging process are reduced due to filtering of the filter materials and the filter screen.