Abstract: Objectives This study aims to investigate the implosion shock load characteristics and thermodynamic mechanisms of ceramic pressure hull in the extreme environment of the deep sea. Methods Firstly, a numerical simulation method for implosion of deep-sea ceramic pressure hull based on a compressible multiphase flow model with pressure-velocity-temperature equilibrium and adaptive mesh encryption is proposed, which enables accurate prediction of the shock wave and fine capture of the flow field. Then, underwater implosion experiments of ceramic pressure hull are carried out to verify the validity of the numerical method; Finally, the numerical study of implosion of ceramic pressure hull in the 10,000 m depth reveals the characteristics of the implosion shock load and thermal effects. The implosion of deep-sea ceramic pressure hull with different water depth and water temperature is studied numerically and its influence rule is analyzed. Results The implosion of deep-sea ceramic pressure hull will release shock waves outwards and produce significant thermal effect when the gas is violently compressed. With the increase of ambient pressure, the peak overpressure coefficient of the implosion shock wave decreases and the attenuation rate increases; However, ambient water temperature does not significantly affect the implosion characteristics of ceramic pressure hull. Conclusions This study reveals the implosion characteristics of deep-sea ceramic pressure hull, which has positive theoretical significance and engineering value for the assessment and protection research of underwater implosion.