Public　health　emergencies　occurred　frequently,　which　usually　result　in　the　negative　Internet　public　opinion　events.　In　the　complex　network　information　ecological　environment,　multiple　public　opinion　events　may　be　aggregated　to　generate　public　opinion　resonance　due　to　the　topic　category,　the　mutual　correlation　of　the　subject　involved,　and　the　compound　accumulation　of　specific　emotions.　In　order　to　reveal　the　phenomenon　and　regulations　of　the　public　opinion　resonance,　we　firstly　analyze　the　influence　factors　of　the　Internet　public　opinion　events　in　the　public　health　emergencies.　Then,　based　on　Langevin＇s　equation,　we　propose　the　Internet　public　opinion　stochastic　resonance　model　considering　the　topic　relevance.　Furthermore,　three　exact　public　health　emergencies　in　China　are　provided　to　reveal　the　regulations　of　evoked　events　＇revival＇caused　by　original　events.　We　observe　that　the　Langevin　stochastic　resonance　model　considering　topic　relevance　can　effectively　reveal　the　resonance　phenomenon　of　Internet　public　opinion　caused　by　public　health　emergencies.　For　the　original　model　without　considering　the　topic　relevance,　the　new　model　is　more　sensitive.　Meanwhile,　it　is　found　that　the　degree　of　topic　relevance　between　public　health　emergencies　has　a　significant　positive　correlation　with　the　intensity　of　Internet　public　opinion　resonance.　©　2021　Quan　Cheng　et　al.