AbstractWe present a comprehensive study on anisotropic magnetocaloric porperties of the van der Waals weak-itinerant ferromagnet Fe_3−xGeTe₂ that features gate-tunable room-temperature ferromagnetism in few-layer device. Intrinsic magnetocrystalline anisotropy is observed to be temperature-dependent and most likely favors the long-range magnetic order in thin Fe_3−xGeTe₂ crsytal. The magnetic entropy change ΔS_M also reveals an anisotropic characteristic between H//ab and H//c, which could be well scaled into a universal curve. The peak value $-Δ {S}_{M}^{{\max }}$−ΔSMmax of 1.20 J kg⁻¹ K⁻¹ and the corresponding adiabatic temperature change ΔT_ad of 0.66 K are deduced from heat capacity with out-of-plane field change of 5 T. By fitting of the field-dependent parameters of $-Δ {S}_{M}^{{\max }}$−ΔSMmax and the relative cooling power RCP, it gives $-{\rm{\triangle }}{S}_{M}^{{\max }}$−∆SMmax ∝ Hⁿ with n = 0.603(6) and RCP ∝ H^m with m = 1.20(1) when H//c. Given the high and tunable T_c, Fe_3−xGeTe₂ crystals are of interest for fabricating the heterostructure-based spintronics device.