Bubble-microplastic (MP) interaction is a significant process that changes the routes of MP circulation in marine environment and thereby determines the risk of MPs, which could be strongly influenced by natural organic matter (NOM) in oceans. However, the quantitative interaction mechanisms between bubbles and MPs under the effect of NOM remain elusive. Herein, bubble-MP interactions in simulated seawater were quantified at nanoscale based on atomic force microscope coupled with the Stokes-Reynold-Young-Laplace model. Bubble-polystyrene (PS)/polyvinyl chloride (PVC) MP interactions exhibited stronger hydrophobic interactions (decay length D