Background:　In　the　knowledge　economy　era,　the　effective　acquisition　and　application　of　knowledge　has　become　a　key　element　for　enterprises　to　obtain　a　competitive　advantage.　The　rapid　development　of　the　Internet　has　spawned　a　large　number　of　virtual　communities,　providing　a　convenient　channel　for　organizations　and　individuals　to　share　knowledge.　However,　while　virtual　communities　provide　users　with　knowledge-sharing　channels,　there　is　also　a　common　phenomenon　that　users＇　participation　enthusiasm　is　not　high.　The　social　cognitive　theory　emphasizes　the　important　influence　of　environmental　factors　on　the　development　of　things.　Objective:　To　study　the　influencing　factors　of　knowledge　sharing　from　the　perspective　of　the　virtual　community　platform　environment,　which　will　help　to　improve　the　construction　of　the　external　environment　and　promote　knowledge　sharing　in　virtual　community.　Methods:　Firstly,　based　on　the　perspective　of　the　platform　environment,　put　forward　relevant　hypotheses　about　the　influencing　factors　of　knowledge　creation　and　knowledge　dissemination　in　virtual　community,　then　design　a　questionnaire　and　conduct　research,　and　finally　test　the　hypotheses　by　using　the　method　of　structural　equation　model.　Conclusion:　community　trust,　community　management,　community　motivation,　community　activity　and　information　protection　all　have　a　significant　positive　impact　on　the　knowledge-sharing　behavior　of　community　users.　In　terms　of　impact,　community　trust　has　the　greatest　impact　on　users＇　knowledge　sharing　behavior,　followed　by　community　management,　and　community　activity　has　the　least　impact.　Innovation/limitations:　This　paper　is　an　empirical　study　on　the　impact　of　knowledge　sharing　in　virtual　communities　from　the　perspective　of　platform　environment.　The　research　perspective　has　a　certain　novelty.　However,　the　data　source　of　this　paper　is　based　on　an　online　questionnaire　survey,　and　there　may　be　some　data　that　are　not　objective　and　accurate.　©　2022　Elsevier　Ltd