The utility model provides a depth well foundation pit dewatering system on compound stratum of large -scale foundation ditch, relates to civil engineering technical field, and that solve is the technical problem who improves the precipitation effect and shorten the precipitation cycle. This system includes at least one deep vacuum tubular well unit, to a plurality of shallow layer precipitation tubular well units, each deep vacuum tubular well unit lay the density of laying that density is lighter than each shallow layer precipitation tubular well unit, utilize deep vacuum tubular well unit to carry out dry out at a slow speed to the deep soil layer of foundation ditch to utilize shallow layer precipitation tubular well unit and deep vacuum tubular well unit to implement quick dry out jointly to the shallow portion soil layer of foundation ditch. The system provided by the utility model, be applicable to the precipitation operation on the compound stratum of large -scale foundation ditch.