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This study proposes a broadband absorber based on graphene and one-dimensional photonic crystal (1DPC) to achieve magnetically tunable broadband absorption in the terahertz (THz) frequency range. The performance is analyzed using the 4 × 4 transfer matrix method, demonstrating that the proposed absorber operates in a broadband range of 3.34 to 4.68 THz for left-handed circularly polarized (LCP) waves with an absorption greater than 90%. The localized THz wave produces absorption peaks, achieves broadband with high absorption, and is tuned dynamically by varying the magnetic field. This work has potential for many applications, such as broadband filters, anti-radar stealth, and sensors.