To investigate the influence of hydrogen charging current density on hydrogen diffusion coefficients in 2.25Cr1Mo0.25 V steel under elastic tensile deformation, this study constructed an in situ coupled experimental platform integrating electrochemical hydrogen charging and elastic tensile testing. Electrochemical hydrogen charging experiments were conducted under both stress-free and elastic tensile conditions. The results demonstrate that within the current density range of 5–20 mA/cm2, the apparent hydrogen diffusion coefficient (Dapp) and effective hydrogen diffusion coefficient (Deff) of the steel under elastic tensile loading are significantly higher than those under stress-free conditions. Although both coefficients exhibit similar increasing trends with rising current density, their growth rates progressively diminish at higher current densities, with a more pronounced attenuation observed in Deff compared to Dapp.