With　the　development　of　internet　of　things　(IoT)　network　in　recent　years,　while　the　centralization　data　management　brings　longer　delay　while　has　more　safety　troubles.　Moreover,　once　a　single　device　is　attacked,　the　system　crashes.　So,　blockchain　technique　which　could　realize　safety　distributed　data　management　is　introduced.　However,　the　consensus　mechanism　of　blockchain　consumes　huge　computation　resources.　And　the　storage　of　entire　ledger　also　consumes　huge　storage　resources　of　the　blockchain　nodes.　Due　to　the　limited　capacity　of　IoT　devices,　the　nodes　cannot　afford　the　computation　resources　to　reach　consensus　and　caching　resources.　This　paper　introduces　an　architecture　of　edge　computing　based　blockchain　network　which　makes　use　of　the　computation　and　caching　capacity　of　edge　server　to　help　the　IoT　devices　in　reaching　consensus　and　storing　data.