With　the　deepening　integration　of　power　and　transportation　networks,　it　is　crucial　to　study　effective　strategies　to　optimize　the　overall　system.　Based　on　variational　inequality,　this　paper　proposes　an　optimal　pricing　strategy　for　coupled　network　considering　mixed　demand　uncertainties　to　guide　the　system　to　achieve　the　optimal　operation　state　under　uncertain　risk.　First,　this　paper　studies　the　road　congestion　toll　strategy　to　promote　the　optimal　operating　of　the　transportation　system,　which　theoretically　shows　that　the　strategy　can　guide　and　change　the　behavior　of　users　and　realize　the　optimal　operation　state　of　the　system.　Secondly,　the　optimal　pricing　model　of　the　coupled　network　is　proposed,　and　its　equivalent　variational　inequality　form　is　derived.　On　this　basis,　a　robust　pricing　model　of　power　transportation　coupling　network　considering　mixed　demand　uncertainty　and　its　equivalent　variational　inequality　form　are　proposed　to　transform　the　complex　robust　optimization　problem　into　a　variational　inequality　problem,　which　provides　a　new　solution　to　the　complex　robust　optimization　problem　of　power　transportation　coupling　network.　Finally,　the　simulation　based　on　the　test　system　can　verify　the　effectiveness　of　the　proposed　method.　©2023　Chin.Soc.for　Elec.Eng.