The density of litter on the Channel Island's beaches is the third highest in the UK and islands, a survey found.
About 1,446 items of rubbish were found per kilometre, a 2% rise on 2007.
Over 350 volunteers took part in the Beachwatch survey last October, picking up litter on 35 of the islands' beaches and recording their findings.
The survey is compiled annually by the Marine Conservation Society, which is calling for governments to take more action to tackle marine litter.
Earlier this week two Guernsey beaches were closed to the public after being strewn with broken glass bottles.
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