Multipartite　entangled　states　involving　nonlocality　are　one　of　the　most　fascinating　characteristics　of　quantum　mechanics.　In　this　work　we　propose　a　thermal-dephasing-tolerant　generation　of　mesoscopic　entangled　states　with　Rydberg　dressed　atoms.　We　encode　a　logical　state　on　dressed　states　rather　than　Rydberg　states.　Such　treatment　can　increase　the　lifetime　of　multipartite　entanglement　coherence　to　around　three　times　compared　to　the　Rydbergstate-coding　one　at　the　same　system　size　and　therefore　induce　solid　fidelities　of　mesoscopic　superposition　states　generation.　The　current　work　theoretically　verifies　the　advantages　of　using　Rydberg　dressed　states　in　many-body　quantum　entanglement,　which　is　helpful　for　large-scale　quantum　computation　and　many-body　Rydberg　quantum　simulation.