Disclosed is an upflow non-point pollution abatement system that allows non-point pollutants contained in contaminated water remaining in a nonpoint pollution abatement process to be backwashed. The upflow-type non-point pollution abatement system is provided with a path through which polluted water flows due to a nonpoint pollution source, and a first settling tank for separating and depositing sedimentation material from the polluted water; A filtration tank provided with a path through which the separated polluted water flows, and a filtration tank for filtering the floating material from the separated polluted water; And washing water mixed with the silent material and washing water mixed with the suspended material by spraying air or washing water to wash the flocculent material remaining in the first silt bath and the filtration tank, And a backwash water tank for backwashing while flowing in a direction opposite to the flow direction. Thus, according to the embodiment of the present invention, by the step of reducing the number of polluted water by the nonpoint pollution source, the flocculent material remaining in the filtration tank and the flocculent material remaining in the first settling tank are backwashed, It is possible to prevent the efficiency from decreasing.
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