The invention belongs to the technical field of filtering separation and particularly relates to a filtering sand settling tank, which comprises a tank body and a liquid inlet pipe, wherein a liquid storage area and a sand settling area are arranged in the tank body; a filtering wall is arranged between the liquid storage area and the sand settling area; the water inlet pipe is communicatedwith the sand settling area; a sand outlet is formed in the bottom of the side edge of the sand settling area; a liquid drainage opening is formed in the side edge of the liquid storage area. The filtering sand settling tank provided by the invention has the benefits as follows: the requirement of recycling fracturing fluid is met, the construction requirements of green testing for oil at present are met, the sand settling area adopts a funnel-shaped structure, so that the sand settling area can be cleaned directly, manual sand removal is avoided, labor strength of site staff and operation process are reduced greatly, and the filtering sand settling tank has higher economic and social benefits on the aspects of energy conservation and consumption reduction, environmental protection, and intrinsic safety.