In　this　study,　the　anti-chiral　negative　Poisson＇s　ratio　structure　BaTiO3　piezoelectric　ceramics　were　fabricated　by　vat　photopolymerization　3D　printing　technology,　which　obtained　an　ultra-high　transverse　piezoelectric　coefficient　d31.　Here,　we　performed　uniaxial　compressive　load　simulations　and　electric　field-driven　lattice　in-plane　strain　response　simulations,　which　showed　an　in-plane　negative　Poisson＇s　ratio　of　−1　for　the　BaTiO3　ceramics.　Its　strain　amplification　is　about　10　times　that　of　BaTiO3　bulk　material.　Using　the　principle　of　positive　and　negative　piezoelectric　effects,　we　measured　effective　transverse　piezoelectric　coefficients　d31　for　different　dimensional　parameters.　The　effective　transverse　piezoelectric　coefficient　d31　with　a　maximum　of　599　pm/V　was　detected　at　a　ligament　aspect　ratio　of　3.6　for　the　negative　Poisson＇s　ratio　BaTiO3　piezoelectric　ceramics,　which　is　7.7　times　higher　than　that　of　the　bulk　material.　For　the　prepared　hydrophone,　test　results　show　that　the　effective　hydrostatic　strain　constant　dh　and　Hydrostatic　Figure　of　Merit　(HFOM)　of　BaTiO3　piezoelectric　ceramics　with　a　negative　Poisson＇s　ratio　structure　are　29.6　and　808　times　higher　than　those　of　bulk　BaTiO3.　©　2023　Elsevier　B.V.