The　present　review　not　only　devotes　on　the　environmental　consequences　of　plastic　bag　wastes　and　other　industrial　wastes　observable　in　the　landfills,　in　the　oceans　or　elsewhere　but　also　gives　a　new　insight　idea　on　conversion　of　them　into　worth　material,　carbon,　for　the　best　electrochemical　supercapacitor.　Transformation　of　plastic　wastes　into　high-value　materials　is　the　incentive　for　plastic　recycling,　end-of-life　handling　case　for　plastic　bag　wastes　in　practice　quite　limited.　The　plastic　recycling　waste　for　reuse　saves　energy　compared　with　manufacturing　virgin　materials.　Herein,　we　identified　several　synthetic　methods　to　convert　plastic　waste　and　other　industrial　wastes　into　carbon　material　for　supercapacitor.　Different　kinds　of　carbon　materials,　including　nanofiber,　nanotube,　graphene,　mesoporous　carbon,　etc.,　have　been　derived　from　plastic　waste,　and　thus　give　a　superior　potential　for　transforming　trash　into　a＂gold　capacitor＂.　Finally,　conclusions　and　future　trends　of　high-voltage　supercapacitors　were　made　as　well　as　the　easy　and　mass　production　of　high-performance　electrode　materials　for　supercapacitors.　Our　work　offers　a　promising　sustainable　approach　to　handle　plastic　bags,　waste,　and　other　industrial　wastes　and　provides　a　new　avenue　in　supercapacitor　applications　and　other　areas.