Due　to　its　decentralized　feature,　blockchain　system　makes　it　difficult　to　connect　blockchain　with　the　Internet,　which　makes　the　application　environment　of　blockchain　limited,　especially　when　the　smart　contract　requires　external　data　trigger.　Among　the　existing　solutions,　many　of　them　do　not　consider　the　security　and　credibility　of　the　Blockchain　upload　data.　This　is　contrary　to　the　original　intention　of　the　blockchain　system.　To　solve　this　problem,　this　paper　proposes　a　trusted　data　recognition　scheme　based　on　machine　learning　model.　This　makes　the　data　on　the　chain　more　secure　and　reliable.　©　2020　IEEE.