The invention discloses a deep collection water stop used for foundation pit construction of a water-rich sand stratum. The deep collection water stop comprises water stop flanges, a waterproof plate, a water stop rubber mat, a water stop steel ring, a filter screen and a box body. The deep collection water stop has the advantages of being simple and reasonable in structure, convenient to machine and manufacture, low in cost and remarkable and visible in water pumping and draining effect, the pressure of underground water to a concrete bottom slab is eliminated, and finally the purposes of pressure relief and water stopping are achieved.