The present invention provides an infiltration trench type nonpoint pollution reduction facility with an improved phosphorus removing function. According to the present invention, the infiltration trench type nonpoint pollution reduction facility includes a setting tank and a filter tank. The setting tank comprises: a space unit having a bottom connected to a rainwater inflow path on an upper part of one side; a supply pipe connected to the rainwater inflow path guiding rainwater to a lower part; and an oil inflow prevention tank preventing oil from inflowing by maintaining a water level higher than a lower end of the supply pipe in the supply pipe by accommodating a lower end of the supply pipe inside. The oil inflow prevention tank is filled with the rainwater flowing through the supply pipe in advance, and the rainwater flows into the setting tank on an outer side of the oil inflow prevention tank. The filter tank is connected to the setting tank by a connection path formed on an upper part on the other side of the setting tank, and a plurality of filter layers are laminated in a space unit enclosed by a side wall. After the water flowing into the setting tank is filtered by passing through the plurality of filter layers, the water flows out through the lower end.
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