The invention relates to a thick weathering crust leaching type rare earth ore in-situ leaching layered liquid collecting system. The system comprises three layers of liquid collecting guide hole groups, liquid collecting ditches and a liquid collecting tank, wherein the three layers of liquid collecting guide hole groups are respectively arranged at one third and two thirds of an ore body thickness and 5-15 cm below the interface between a semi-weathered layer and bedrock along the direction of the ore body; the liquid collecting ditches correspond to the three layers of liquid collecting guide hole groups one by one; the liquid collecting tank is arranged in a valley; the liquid collecting guide hole groups all comprise a plurality of liquid collecting guide holes which are parallel andarranged at intervals; the liquid collecting ditches are arranged around the ore body and positioned 20-50 cm below the corresponding liquid collecting guide hole groups; and the liquid collecting ditches all communicate with the liquid collecting tank through pipelines. By arranging the three layers of liquid collecting guide hole groups, the liquid is collected in a layered manner, and the rareearth recovery rate is improved; and each liquid collecting guide hole group and the corresponding liquid collecting ditch form a liquid collecting system, and the formed three layers of liquid collecting systems are independent from one another, so that the continuous and efficient production of the thick weathering crust leaching type rare earth ore is advantageously achieved.