Two-dimensional (2D) magnetic materials have attracted significant attention due to their unique properties and potential applications in spintronics. Using first-principles calculations and group theory analysis, we propose a novel two-dimensional chiral magnetic semiconductor ${\mathrm{FeZrCl}}_6$. The monolayer (ML) ${\mathrm{FeZrCl}}_6$ is dynamically stable and hosts a coplanar noncollinear 120° antiferromagnetic ground state on a triangular lattice, characterized by vector-spin chirality. The group theory analysis reveals that this unique magnetic order activates the anomalous Hall effect (AHE) and magneto-optical Kerr effect (MOKE). During collective in-plane spin rotation, both the AHC and Kerr rotation angle exhibit $2\pi /3$ periodicity dependence on the azimuthal angle $\phi$. Furthermore, out-of-plane spin canting generates a finite scalar-spin chirality, producing an emergent real space Berry phase and thereby inducing a chirality-driven topological Hall effect (THE) and topological magneto-optical Kerr effect (TMOKE) without spin-orbit coupling. These findings not only identify a promising material candidate for antiferromagnetic spintronics but also provide profound insights into the antiferromagnetic anomalous transport phenomena.

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• Anomalous Hall effect
• Magneto-optical Kerr effect
• 2-dimensional systems
• Antiferromagnets
• First-principles calculations