The discovery of infinite-layer nickelate superconductors has generated great enthusiasm for exploring new nickelate superconductors with higher $T_{\mathrm{c}}$ and further elucidating their superconducting mechanism. In this work, we systematically investigate the pressure effect on both the normal state and superconductivity of ${\mathrm{La}}_{0.8}{\mathrm{Sr}}_{0.2}{\mathrm{NiO}}_2$ thin film by measuring resistance under various hydrostatic pressures up to 7.5 GPa. The results show that $T_{\mathrm{c}}$ exhibits a monotonic increase from $T_{\mathrm{c}}^{\mathrm{onset}}\sim 19$ K at ambient pressure to $T_{\mathrm{c}}^{\mathrm{onset}}\sim 26$ K at 7.5 GPa. Moreover, normal-state resistance displays linear behavior in the measured pressure range, which is a hallmark of the strange metal state. The constructed temperature-pressure phase diagram reveals a potentially universal linear enhancement of $T_{\mathrm{c}}$ in infinite-layer nickelate superconductors at nearly optimal doping. This indicates that the evolution of $T_{\mathrm{c}}$ can be affected by multiple factors and can be further enhanced by pressure, epitaxial stress, or substitution of rare-earth metals. Our work provides critical insights for further enhancing $T_{\mathrm{c}}$ and constructing theoretical models to explore the superconducting mechanism in infinite-layer nickelate systems.

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• Superconductivity
• Superconductors
• Unconventional superconductors
• Density functional theory
• Electrical transport techniques
• Pressure techniques