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We first present the multicolor photometry results of the rapidly rotatingmagnetic star HD 345439 using the Nanshan One-meter Wide-field Telescope. Fromthe photometric observations, we derive a rotational period of 0.7699\pm0.0014day. The light curves of HD 345439 are dominated by the double asymmetricS-wave feature that arises from the magnetic clouds. Pulsating behaviors arenot observed in Sector 41 of the Transiting Exoplanet Survey Satellite. Noevidence is found of the occurrence of centrifugal breakout events neither inthe residual flux nor in the systematic variations at the extremum of the lightcurve. Based on the hypothesis of the Rigidly Rotating Magnetosphere model, werestrict the magnetic obliquity angle {$\beta$} and the rotational inclinationangle $i$ so that they satisfy the approximate relation {$\beta + i \approx105^{\circ}$}. The colour excess, extinction, and luminosity are determined tobe $E_{(B-V)}=0.745\pm0.016\,$mag, $A_{V}=2.31\pm0.05\,$mag, and $\rmlog\,(L/L_{\odot})=3.82\pm0.1 $dex, respectively. Furthermore, we derive theeffective temperature as $T$$\rm _{eff}=22\pm1 $kK and the surface gravity aslog$g=4.00\pm0.22$. The mass$ M=7.24_{-1.24}^{+1.75}\rm M_{\odot}$, radius$R=4.44_{-1.93}^{+2.68}\rm R_{\odot}$, and age$\rm\tau_{age}=23.62\,_{-21.97}^{+4.24} $Myr are estimated from theHertzsprung--Russell Diagram

Photometric properties and stellar parameters of the rapidly rotating magnetic early-B star HD 345439