Natural　gas　hydrate　(NGH)　is　a　potentially　green　energy　resource　for　the　future.　Five　trial　production　experiments　of　marine　NGH　have　been　carried　out　worldwide.　However,　the　currently　widely　used　drilling　method　has　poor　economic　applicability,　and　there　are　still　many　critical　technical　problems　that　need　to　be　solved.　Based　on　the　characteristics　of　marine　NGH　reservoir　and　the　exploration　principle,　a　novel　self-entry　exploration　device　(SEED)　according　to　the　penetration　mechanism　of　torpedo　anchor　was　proposed,　and　the　working　principle　was　described　in　detail.　The　SEED　could　significantly　reduce　the　cost　of　NGH　exploitation　because　it　eliminates　the　need　for　deepwater　drilling　rigs.　Moreover,　unlike　traditional　cement　wellbore,　the　SEED　is　an　artificial　rigid　structure　that　withstands　greater　depressurization　to　increase　efficiency.　The　penetration　laws　and　gas　production　characteristics　of　the　SEED　were　studied　through　numerical　simulation.　The　research　results　show　that　the　penetration　depth　into　the　seabed　can　reach　more　than　300　m,　which　can　cover　most　of　the　NGH　reservoirs＇　depth.　The　gas　production　efficiency　is　significantly　improved　compared　to　the　traditional　wellbore.　The　SEED　has　specific　potential　for　exploring　marine　NGH,　providing　a　new　idea　for　commercial　exploitation.　©　2022　Elsevier　Ltd