Enhancement of the Curie temperature $\left(T_C\right)$ has always been a vital problem since the discovery of two-dimensional (2D) van der Waals (vdW) magnets. The interfacial effect from layers with strong spin-orbit coupling (SOC) has been widely investigated to be an effective method. Here, we experimentally show that $T_C$ of vdW $\mathrm{CrP}{\mathrm{S}}_4$ is enhanced from 40 K up to room temperature by the interfacial effect from graphene with weak SOC. The compatible Fermi level between $\mathrm{CrP}{\mathrm{S}}_4$ and graphene enables sufficient interfacial charge transfer across their atomically fine interface, leading to largely elevated $T_C$ of $\mathrm{CrP}{\mathrm{S}}_4$ at the interface without the participation of strong SOC. The enhanced magnetism of $\mathrm{CrP}{\mathrm{S}}_4$ further induces room-temperature exchange splitting in graphene by the magnetic proximity effect, which is shown in the quantum oscillation controlled by field cooling and temperature-dependent resistance. Our work reveals a mechanism for the enhancement of $T_C$ in vdW magnets and the achieved room-temperature all-2D magnetic proximity effect also advances the practical applications of miniaturized low-dissipative 2D spintronics.

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• Magnetic anisotropy
• Magnetic coupling
• Magnetotransport
• Spin-orbit coupling
• Surface states