The utility model discloses a detachable is fit for the sampling device that pleuston was gathered to fresh water flowing water environment, the collection net with collect the netcom and cross and gather the pipe and link to each other, the sampler with collect the netcom and cross and gather the pipe and link to each other, collection net etting bottom mounting net gape steel ring, collection net etting top is used the buckle lock and is being gathered the pipe upper end, the buckle lock was at collection net net gape under collection pipe lower extreme was used, collect the fixed rack of collecting of net net gape, four collection net racks pass through the screw fixation with collection net rack and collection net rack. This device simple structure, can dismantle, conveniently carry, easily fixable, can be used to ecology, the open -air pleuston investigation work of environmental monitoring trade, have certain application prospect in fields such as ecology, environment impact assessment researchs.