A　novel　optical　fiber　filling　glue　level　sensor　based　on　the　oxide-doped　optical　fiber　annular　structure　is　designed　and　experimentally　fabricated.　As　far　as　we　know,　this　is　the　first　time　to　measure　the　filling　glue　level　with　optical　fiber　sensor　in　which　the　core　of　the　optical　fiber　is　doped　with　hybrid　oxide　material　and　the　refractive　index　(RI)　of　the　core　is　linearly　distributed.　The　sensor　model　is　constructed　and　analyzed　by　a　finite-element　method.　The　fast　Fourier　transform　(FFT)　is　used　to　explore　the　interference　characteristics　of　transmission　spectrum.　The　experimental　results　show　that　the　filling　glue　level　sensitivity　of　the　sensor　is　as　high　as　0.282　nm/mm　within　the　extremely　wide　liquid　level　range　of　0-110　mm,　in　which　the　level　resolution　of　the　measuring　system　is　as　high　as　0.075　mm　and　the　linearity　up　to　0.999.　The　crosstalk　of　the　heat　released　by　the　filling　glue　to　the　level　measurement　is　insignificant　compared　to　the　sensitivity　and　measurement　range　of　the　level.　Ultrafast　time　response　characteristics　and　ultrahigh　long-term　stability　are　fully　reflected.　What　is　more,　the　sensor　has　the　advantages　of　good　robustness,　simple　structure,　and　tunable　measurement　range.