The　magnetic　Ni@h-BN　composites　containing　the　uniform　Ni　nanoparticles　supported　on　h-BN　nanosheets　have　been　prepared　via　a　facile　solvothermal　method.　The　as-prepared　samples　show　high　catalytic　performance　for　H2　generation　from　the　ammonia　borane　aqueous　solution,　especially　for　the　Ni@h-BN　with　25.0　wt%　Ni　content.　Moreover,　the　Ni@h-BN　composites　possess　a　good　ferromagnetic　property　at　room　temperature,　endowing　them　with　rapid　magnetic　separation　to　recycle.　The　kinetics　of　the　hydrolysis　of　ammonia　borane　over　the　Ni@h-BN　composites　were　further　investigated　in　detail.　It　is　found　that　the　hydrogen　generation　was　highly　dependent　on　the　catalyst　amount　and　the　reaction　temperature.　The　activation　energy　of　the　hydrolysis　reaction　of　ammonia　borane　is　found　to　be　47.3　kJ　mol−1　over　the　Ni@h-BN　with　25.0　wt%　Ni　content.　Considering　the　good　catalytic　activities　for　H2　release,　the　Ni@h-BN　composites　are　expected　to　find　important　application　in　fuel　cells　and　the　related　fields.　©　2017　Hydrogen　Energy　Publications　LLC