Magnetic kagome materials have emerged as a new platform for exploring exotic topological transport phenomena. The anomalous Hall effect, a phenomenon prevalently observed in various magnetic kagome materials, is commonly explained using Berry-curvature concepts. Here we report that ${\mathrm{MgMn}}_6{\mathrm{Ge}}_6$, a kagome helimagnet exhibiting a spin-flop transition under magnetic field parallel to the kagome plane, displays a large anomalous Hall conductivity (AHC) of 1179 S/cm at 5 K. The intrinsic AHC reaches approximately 377 S/cm, which is consistent with theoretical calculations and ranks among the highest values reported in magnetic R166 systems. We further reveal that the intrinsic AHC originates from the topological nodal rings at the Fermi level, where a large Berry curvature is induced by the spin-flop transition that breaks time-reversal symmetry. In addition, a pronounced topological Hall effect conductivity of up to 900 S/cm is clearly observed under a magnetic field applied along the [001] $c$-axis direction, strongly indicating the existence of topological magnetic textures. Our results suggest that ${\mathrm{MgMn}}_6{\mathrm{Ge}}_6$ serves as a promising platform for investigating large anomalous transport responses and their interplay with magnetic topological textures.

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• Anomalous Hall effect
• Topological Hall effect
• Helimagnets
• Kagome metal
• Nodal-line semimetals
• Magnetization measurements