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We investigate the collider phenomenology of the scalar triplet particles inthe Type-II seesaw model at a 100 TeV $pp$ collider. Depending on tripletvacuum expectation value $v_\Delta$, the dominant discovery channels could be$H^{++} H^{--}$ and $H^{\pm\pm}H^\mp$. We find the $H^{\pm\pm}H^\mp\to W^\pmW^\pm h W^\mp/\ell^\pm \ell^\pm h W^\mp$ channels are promising for both modeldiscovery at relatively large $v_\Delta$ and determination of the Higgs portalcouplings $\lambda_4$ and $\lambda_5$. We also find that these two channels arecomplementary to indirect determination of $\lambda_4$ from future precisemeasurements on $h\to\gamma\gamma$ decay rate. Together with pair production ofthe doubly-charged Higgs subsequently decaying into same-sign di-leptons, the$H^{\pm\pm}H^\mp$ channels have the potential to cover a significant portion ofthe parameter space of the Type-II seesaw complex scalar triplet model.

Type-II Seesaw Scalar Triplet Model at a 100 TeV $pp$ Collider: Discovery and Higgs Portal Coupling Determination