Foam　glass　is　a　new　insulation　building　materials　and　plays　an　important　role　in　building　energy　efficiency　for　its　many　excellent　performances,　such　as　small　thermal　conductivity,　low　coefficient　of　thermal　expansion　and　high　mechanical　strength.　Generally,　the　manufacturing　process　of　foam　glass　mainly　can　be　classified　into　two　typical　processes,　the　waste　glass　recycling　process　and　glass　melting　process.　In　this　paper,　the　process-oriented　life　cycle　assessment　is　used　to　quantitative　analyze　and　evaluate　the　environmental　load,　such　as　energy　consumption　and　pollutant　emission　of　the　two　typical　processes.　The　results　show　that　the　environmental　load　of　the　glass　melting　process　takes　place　in　two　stages　of　the　foaming　and　annealing,　and　the　raw　material　extraction,　while　the　waste　glass　recycling　process　mainly　come　from　foaming　and　annealing.　Regarding　the　energy　consumption　of　foam　glass,　waste　glass　process　is　lower　22.4%　than　the　glass　melting　process,　while　carbon　emissions　is　lower　24.8%,　and　the　comprehensive　environmental　impact　is　lower　40%.　Therefore,　the　findings　will　guide　and　promote　the　new　technology　application　for　the　energy　saving　and　green　technology　applications　in　foam　glass　industry.　©　2018　Trans　Tech　Publications,　Switzerland.