The invention relates to an filtering pool, includes a square pool, multichip unit filters arranged in the pool, a first clapboard, a second clapboard, a third clapboard connected in turns in the pool, the first clapboard is erected in between a water outlet end and end of the multichip unit filters, the second clapboard is supported on bottom of the multichip unit filters and kept space from bottom of the pool, filter bracket of each unit filter includes a substrate and a frame-type lateral plate, filtration medium is lied on external surface of the frame-type lateral plate and the substrateon the bottom is provided with at least one purified water outlet, and position on the second clapboard corresponding to each purified water outlet is provided with purified water outlet. Comparing with the prior art, the invention applies combination of unit filter processing units, capable of setting processing units flexibly according to processing capacity. The invention provides advantages oflow energy consumption, filter screen with small pore diameter, abrasion-resistance, high fltering speed, good water quality, high processing efficiency, easy replacement and low cost.