Blue Carbon Ecosystems, comprising mangroves, saltmarshes, and seagrasses, located at the land-ocean interface serve as a natural barrier against the transportation of plastic waste from land to the ocean, effectively intercepting and mitigating plastic pollution in the ocean. Considering plastic as an organic carbon compound, the accumulation and burial of plastics in blue carbon sediment is another carbon sequestration pathway, a major ecosystem service provided by the blue carbon ecosystems. However, the extent, nature, and impacts of plastic burial on blue carbon ecosystem processes, including natural organic carbon sequestration and mineralisation, are poorly known. Here, we highlight the current state of research related to plastic trapping by vegetated coastal ecosystems and their subsequent effects on blue carbon biogeochemistry. The notion of beneficial plastic accumulation in blue carbon ecosystems is controversial, yet considering the alternative impacts of plastics on oceanic and aboveground environments, this may be an add-on to the carbon burial mechanism by blue carbon ecosystems. Considering the multifaceted benefits of blue carbon ecosystems, including mitigating climate change and ocean-going plastics, we recommend expanding and managing blue carbon ecosystems as a sustainable mitigation strategy.