Tailing pond duty synergy system and method before pond closing

The invention discloses a tailing pond duty synergy system and method before pond closing, and belongs to the field of tailing ponds. The tailing pond duty synergy system before pond closing comprisesa tailing pond and an in-pond sub-dike, a dry beach face is formed in the tailing pond, the in-pond sub-dike is built on the dry beach face so that an ore drawing area can be formed in the space between the in-pond sub-dike and a tailing dam of the tailing pond in the tailing pond, a drainage area can be formed in the space between the in-pond sub-dike and the pond tail of the tailing pond, the ore drawing area is used for storing tailings, and the drainage area is used for storing water. According to the disclosed tailing pond duty synergy system and method before pond closing, the empty storage capacity above the dry beach face in the tailing pond can be fully occupied, the maximum utilization of the storage capacity of the tailing pond is achieved, and favorable terrain conditions canbe created for pond closin