Lining wall concrete placement top-down method based on underground diaphragm wall

The invention relates to a lining wall concrete placement top-down method based on an underground diaphragm wall. The lining wall concrete placement top-down method comprises the following steps: (1) the underground diaphragm wall is constructed; (2) a foundation floor slab is constructed; (3) an upper floor slab is constructed; (4) a formwork is erected, an upper layer of lining wall concrete is poured, a steel pipe is pre-buried every 2-3 meters in the upper layer of lining wall concrete, and the lower end of each pre-buried steel pipe is arranged on the top of an inverted groove in the lower portion of an upper lining wall which is formed in a pouring mode; (5) a lower lining wall formwork is erected, wherein the formwork is directly connected with the upper lining wall from the bottom surface of the foundation floor slab and is mounted in a closed mode, pump truck concrete delivery pipes used for pouring a lower layer of lining wall concrete are inserted in the pre-buried steel pipes to conduct pouring co