The communication blackout when the space vehicle at ultra-high speed is reentering the atmosphere has always been a challenging task. Based on the Epstein distribution of electron density, the models of oblique incidence terahertz wave propagation are established for magnetized plasma inhomogeneous plasma sheath. The transmittance and attenuation of terahertz wave are numerically calculated. The effects of collision frequency, magnetic field intensity, incident angle, etc. on THz wave attenuation are analyzed. The results shows that with the increase of magnetic field intensity, the minimum transmittance and attenuation peak move to the direction of higher THz frequency. When the electromagnetic wave incident angle becomes larger, the transmittance decreases, and the attenuation increases. When the incident angle is less than or equal to 60o, the maximum attenuation at 0.22 THz of atmospheric window is 5.32 dB. This study provides a theoretical basis for solving the blackout problem.