The invention relates to a follow-up type high-efficiency water-stop and sand-hindrance precipitation complex system and its construction method. The system is suitable for all unconfined aquifers andconfined aquifers. The complex system includes a precipitation well, an infiltration-filtration device arranged in a well pipe of the precipitation well, a sand filter layer which the outside of thewell pips is filled, a follow-up type moving water-stop heavy curtain, a waterway-drain seepage well and a settlement observation point; the precipitation well is arranged in an annular mode along theedge of a foundation pit, and the infiltration-filtration device is composed of plum-blossom shaped distribution holes and steel wire gauzes with which the outsides of the plum-blossom shaped distribution holes are coated; the follow-up type moving water-stop and sand-hindrance heavy curtain is placed on the inner side of the precipitation well in an annular mode; the waterway-drain seepage wellis formed on the inner side of the heavy curtain, and the settlement observation point is arranged on the edge of the foundation pit. According to the system and the construction method, foundation-pit precipitation, infiltration-filtration water collection, underground water stop, grit eroding and pipe gush prevention, and settlement prevention and control technology are integrated into a whole system, the structure is flexible, precipitation is high in efficiency, the collaborative linkage property is good, the building cost of projects is low, the application range is wide, and surface subsidence and other engineering hazards caused by grit eroding and pipe gush can be effectively prevented.