The utility model discloses a runoff district flow distributing and collecting device, including split -flow tank and multistage mass flow bucket, split -flow tank include the gentle fast district inedulcoration district, the edulcoration district separates through filtering gauze between the gentle fast district, edulcoration district down the panel change the board for the activity, the activity is changeed the board below and is equipped with the edulcoration groove, the activity is changeed the board and is passed through a plurality of spring beam and edulcoration inslot wall connection,edulcoration groove one side be equipped with the bin outlet, slow fast district surface be equipped with a plurality of and delay speed belts, it is equipped with a main splitter box and the vice splitter box of a plurality of to delay fast district below, the terminal drainage of main splitter box is inside to the central bucket of multistage mass flow bucket. The device simple structure, simple to operate can effectively prevent the runoff district appeared when discharge was too big jam and overflow phenomenon, reduces and measures experimental error, protection test part.