Kitaev physics has recently attracted attention in condensed matter for its anticipated quantum spin liquid (QSL) state. The thermal transport measurement is crucial for probing the features of charge-neutral quasiparticles. In this letter, we report a significant thermal Hall effect in Na2Co2TeO6 (NCTO), a Kitaev QSL candidate, when the magnetic field is applied along the out-of-plane direction of the honeycomb plane. The thermal conductivity (κxx ) and thermal Hall conductivity (κxy) in NCTO reveal distinct magnetic field dependences below and above the Neel temperature (TN ) of 27 K. For T > TN, κxx has a monotonic decrease in the field dependence, while κxy persists up to T ∗ = 150 K. On the other hand, both κxx and κxy exhibit complex field dependence for T < TN.