Pressure provides a clean and continuous route for tuning electronic structure and magnetic interactions in itinerant ferromagnets without introducing chemical disorder. Here, we report high-pressure structural, transport, and electronic structure studies of hexagonal ferromagnetic ${\mathrm{SmCrGe}}_3$, a rare-earth chromium germanide that exhibits giant uniaxial magnetocrystalline anisotropy and strong coupling between localized Sm $4f$ and itinerant Cr $3d$ electrons. Synchrotron high-pressure x-ray diffraction measurements reveal that the hexagonal $P{6}_3/mmc$ structure remains stable up to 10 GPa without a crystallographic phase transition, indicating that the pressure-driven evolution is primarily electronic rather than structural in origin. High-pressure electrical resistance measurements show a nonmonotonic pressure dependence of the Curie temperature ($T_{\mathrm{C}}$) inferred from the resistance anomaly, where $T_{\mathrm{C}}$ initially decreases with pressure, followed by a slight recovery before the magnetic order is suppressed above 6.4 GPa. Concomitantly, a low-temperature resistance minimum emerges above 4.3 GPa, consistent with enhanced Kondo-like scattering associated with Sm $4f$ electrons. Density functional theory calculations on ${\mathrm{SmCrGe}}_3$ reveal a highly pressure-sensitive Cr-derived flat band near the Fermi level. Systematic lattice-parameter tuning calculations further show that anisotropic lattice compression, particularly along the crystallographic $c$, strongly modifies the flat-band position relative to the Fermi level. These results identify ${\mathrm{SmCrGe}}_3$ as a promising platform for studying the coupled evolution of fragile itinerant ferromagnetism, pressure-sensitive flat-band electronic structure, and emergent $4f$-derived correlated scattering under pressure.

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• Magnetic coupling
• Magnetic order
• Magnetic phase transitions
• Magnetism
• Pressure effects
• Crystal structures
• Density functional theory
• Electrical transport techniques
• X-ray diffraction