Abstract: Objectives Aiming at the problem of implosion of deep-sea ceramic pressure hull in 10,000-meter water depth environment, this paper investigates the effect of different liquid-phase equations of state on the implosion characteristics of deep-sea ceramic pressure hull. Methods Based on the theory of compressible multiphase flow and adaptive mesh refinement method, a numerical simulation method for implosion of deep-sea ceramic pressure hull that can use different kinds of liquid-phase equations of state is proposed, which can realize the refinement of implosion shockwave capture and accurately describe the shockwave load attenuation characteristics. Results The type of liquid-phase equation of state has a large effect on the implosion shockwave load characteristics, and the peak pressure, velocity and the positive overpressure impulse of the implosion shockwave calculated using SG liquid-phase equation of state are more larger. Conclusions The use of different liquid-phase equation of state to describe the extreme flow field environments of deep-sea implosion provides a new shockwave load reference for underwater implosion protection.