The　vegetables　packed　by　plastic　trays　and　fresh-keeping　film　are　getting　more　and　more　popular　in　our　life.　So　the　tray-type　vegetables　preservation　machine　has　became　one　of　hot　research　areas　in　the　world.　During　the　working　process　of　film　sealing　for　vegetables　in　the　tray,　film　is　cut　from　three　directions　and　sealed　based　on　self-adhesive　property.　The　complex　movements　about　packing　in　this　type　cause　that　the　drive　parts　of　film　sealing　device　are　more　complicated.　It　not　only　makes　the　manufacturing　hard,　but　also　leads　to　the　rising　costs.　All　these　disadvantages　limit　the　application　and　popularization　of　tray-type　vegetables　preservation　machine.　Based　on　this　cutting　method,　the　innovation　design　of　film　sealing　device　was　carried　out　by　using　the　linkage　mechanism　of　roller　chute　and　crank-slider　mechanism　to　simplify　the　drives　and　reduce　manufacturing　cost　in　this　study.　As　a　drive　mechanism,　crank-slider　mechanism　was　designed　by　using　MATLAB　for　the　optimal　transmission　performance　when　it　was　working.　According　to　the　calculation,　the　key　design　parameters　of　crank-slider　mechanism　were　determined　as　follows:　the　minimum　transmission　angle　was　42°;　the　length　of　crank　was　140　mm;　the　length　of　connecting　rod　was　340　mm;　the　length　of　connecting　rod　was　340　mm;　the　eccentric　distance　was　109　mm.　And　the　structure　parameter　of　linkage　mechanism　for　roller　chute　was　also　designed.　Its　dynamic　characteristics　were　obtained　using　the　simulation　of　three-dimensional　kinematics　of　cylinder,　transverse　cutting　bar　and　longitudinal　cutting　plate　using　SolidWorks　Motion.　When　the　average　speed　of　cylinder　was　90　mm/s,　the　cutting　speed　of　transverse　cutting　bar　and　longitudinal　cutting　plate　were　710　and　310　mm/s,　respectively,　and　work　efficiency　was　up　to　50　time/　min.　By　analyzing　the　working　method　of　design　scheme,　transverse　cutting　bar　and　swing　rod　were　found　to　have　the　lowest　intensity.　Using　the　SolidWorks　simulation,　the　most　vulnerable　part　of　transverse　cutting　bar　and　swing　rod　was　discovered.　So,　a　prototype　was　fabricated　according　to　the　parameters　design　and　simulation　result.　Based　on　the　prototype,　a　series　of　tests　were　designed　and　carried　out.　Fifty　tests　were　conducted.　In　the　test,　the　plastic　trays　and　rapes　were　regarded　as　film　sealing　object　by　using　PE　cling　film.　By　recording　each　cutting　cycle　time　by　stopwatch　and　calculating　its　average　value,　we　obtained　that　the　efficiency　of　the　prototype　meeting　the　requirements　of　any　available　tray-type　vegetables　preservation　machine　was　40　times/min.　The　simulated　velocity　of　cutting　was　similar　to　the　measured　value.　The　success　rate　of　cutting　was　88%　and　could　be　greatly　improved　if　connection　between　lifting　device　and　film　sealing　device　of　tray-type　vegetables　preservation　machine　is　improved.　The　maximal　testing　cutting　speed　of　transverse　cutting　bar　and　longitudinal　cutting　plate　were　690　and　290　mm/s,　respectively.　Therefore,　it　is　obvious　that　the　new　design　of　film　sealing　device　about　tray-type　vegetables　preservation　machine　is　feasible.　The　study　provides　useful　insights　for　the　related　design　and　has　an　important　significance.　©,　2015,　Chinese　Society　of　Agricultural　Engineering.　All　right　reserved.