IoT　connections　emerge　exponential　growth　trend,　which　poses　a　serious　challenge　to　cloud　computing　due　to　the　limit　of　network　bandwidth.　Edge　computing　provides　a　promising　solution.　however,　the　computing　power　of　edge　side　isn＇t　enough　to　complete　large　scale　tasks.　Hence,　to　solve　computing　power　shortage,　a　collaborative　edge　network　(CEN)　model　is　proposed,　including　system　model　and　network　communication　model.　Further,　to　estimate　the　performance　of　CEN,　we　design　and　implement　ant　colony　algorithm　to　schedule　tasks　for　IoT　scenarios.　The　simulation　results　show,　as　the　mobile　devices　increase　to　1500,　the　CEN　reduces　significantly　average　task　complete　time　by　90%　and　task　failure　rate　(TFR)　by　10%　compared　with　OnlyEdge.　And　the　CEN　reduces　sharply　TFR　by　70%　compared　with　OnlyCloud.　As　a　consequence,　the　comprehensive　performance　of　CEN　is　leading,　which　has　more　powerful　access　ability　to　serve　enormous　IoT　devices.