The　study　of　the　co-transport　of　Cr(VI)　and　microplastics　(MPs)　in　porous　media　is　important　for　predicting　migration　behavior　and　for　achieving　pollution　removal　in　natural　soils　and　groundwater.　In　this　work,　the　effect　of　MPs　on　Cr(VI)　migration　in　saturated　porous　media　was　investigated　at　different　ionic　strengths　(ISs)　and　pHs.　The　results　showed　that　pH　7　and　low　IS　(5　mM),　respectively,　promoted　the　movement　of　Cr(VI),　which　was　further　promoted　by　the　presence　of　MPs.　The　Derjaguin-Landau-Verwey-Overbeek　(DLVO)　results　showed　that　the　repulsive　energy　barrier　between　MPs　and　quartz　sand　decreased　with　increasing　IS　and　decreasing　pH,　respectively,　which　promoted　the　retention　of　MPs　in　quartz　sand　and　constrained　the　competition　of　Cr(VI)　for　adsorption　sites　on　the　surface　of　the　quartz　sand,　thus　facilitating　the　enhanced　migration　of　Cr(VI),　while　Cr(VI)　behaved　conversely.　Sodium　alginate/nano　zero-valent　iron-reduced　graphene　oxide　(SA/NZVI-rGO)　gel　beads　could　achieve　the　removal　of　MPs　through　a　pi-pi　interaction,　hydrogen　bonding,　and　electrostatic　attraction,　but　the　MPs　removal　would　be　reduced　by　40%　due　to　the　competitive　adsorption　of　Cr(VI).　Notably,　97%　Cr(VI)　removal　could　still　be　achieved　by　the　gel　beads　in　the　presence　of　MPs.　Therefore,　the　gel　beads　can　be　used　as　a　permeation　reaction　barrier　to　inhibit　the　MP-induced　high　migration　of　Cr(VI).　The　Cr(VI)　breakthrough　curves　in　reactive　migration　were　well-fitted　with　the　two-site　chemical　nonequilibrium　model.　Overall,　the　findings　of　this　work　contribute　to　the　understanding　of　the　migration　behavior　of　Cr(VI)　and　MPs　in　saturated　porous　media　and　provide　a　theoretical　basis　for　the　remediation　of　soils　and　groundwater　contaminated　with　Cr(VI)　and　MPs.