The recent detection of the ultrahigh-energy neutrino event KM3-230213A ($\sim 220\mathrm{PeV}$) by KM3NeT telescope poses a challenge to conventional astrophysical models, particularly in light of the absence of similar $\gtrsim 100\mathrm{PeV}$ events in IceCube data, despite its larger exposure. We propose a novel mechanism in which binary black hole mergers act as transient neutrino sources via gravitationally induced electroweak vacuum instability. In this scenario, the extreme spacetime curvature near the horizons during the final inspiral phase destabilizes the Higgs vacuum, triggering nucleation of true-vacuum bubbles. Collisions between these bubbles produce microscopic black holes that rapidly evaporate via Hawking radiation, emitting intense, short-lived bursts of neutrinos with energies exceeding 100 PeV. The resulting neutrino fluence follows a heavy-tailed distribution, allowing rare but highly luminous sources to account for events like KM3-230213A while remaining consistent with IceCube’s nondetections. This framework links gravitational wave sources to ultrahigh-energy neutrino production and suggests that future multimessenger observations may detect electromagnetic signatures from microscopic black hole evaporation.

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