An integrated eliminating device and its method for initial runoff pollution is provided, wherein a plurality of the water receiving pipes for collecting initial runoff are gathered and connected to the first water reservoir, one end of the water inlet pump is connected with the first water reservoir via the water receiving pipes, and the other end of the intake pump is connected with an water inlet opening of the rice field; the rice field is divided into a plurality of sub-parcels in a shape of long stripes, a regulating gate is set. An outlet of the rice field is communicated with the second water reservoir and which is communicated with the water inlet opening of the rice field via the reflux pump.
