Sintering　for　large‐sized,　stoichiometric　Bi0.5Na0.5TiO3　(BNT)　ceramics　is　of　great　challenge　due　to　the　loss　of　volatile　Bi/Na　at　A‐site　of　perovskite　structure.　In　this　work,　BNT　ceramic　tile　with　the　size　of　∼10 × 10 cm2　and　near‐stoichiometric　composition　has　been　successfully　fabricated　by　Isobam‐assisted　gelcasting　process,　followed　by　sintering　with　1150°C　calcined　power　bed.　The　powder　bed　used　and　sintering　duration　were　found　to　have　a　great　influence　on　the　formation　of　the　Na‐deficient　phase　(Bi4.5Na0.5Ti4O15)　in　the　ceramics,　and　the　strategies　to　eliminate　it　have　been　explored.　The　obtained　ceramics　exhibit　a　dielectric　constant/loss　of　673.6/0.039　at　1 kHz,　as　well　as　an　electrostrictive　strain　of　∼0.07%　which　corresponds　to　a　converse　piezoelectric　constant　d33∗$d_{33}^*$　of　105.2 pm/V.　Our　work　thus　provides　an　effective　approach　to　prepare　large‐sized　and　stoichiometric　BNT　ceramics.