The　metaverse　provides　us　with　an　attractive　virtual　space　in　which　the　value　of　the　virtual　property　has　been　increasingly　recognized.　However,　the　lack　of　effective　cross-metaverse　trading　tools　and　the　reputation　guarantee　makes　it　difficult　to　trade　items　among　different　metaverses.　To　this　end,　a　decentralized　reputation　system　for　virtual　items　trading　forum　named　DVIT　is　devised.　To　the　best　of　our　knowledge,　DVIT　is　the　first　decentralized　cross-metaverse　item　trading　prototype　inspired　by　the　online-game　trading　system.　We　designed　the　corresponding　transaction　function　and　realized　the　autonomous　governance　of　the　community　by　introducing　the　reputation　mechanism.　An　improved　election　mechanism　is　proposed　to　improve　efficiency　based　on　Delegated　Proof-of-Stake　(DPoS).　Through　token　rewards　associated　with　activity　levels,　users＇　motivation　can　be　stimulated.　The　experiments　indicate　that　our　proposed　scheme　could　dynamically　measure　the　trustworthiness　degree　of　the　users　through　the　dynamic　reputation　value　and　thereby　exclude　malicious　users　from　the　blockchain　within　20　epochs.