Single-crystal growth, magnetic properties, and magnetocaloric effect of the S=3/2 kagome ferromagnet Li9Cr3(P2O7)3(PO4)2 (trigonal, space group: P3¯c1) are reported. Magnetization data suggest dominant ferromagnetic intraplane coupling with a weak anisotropy and the onset of ferromagnetic ordering at TC?2.6 K. Microscopic analysis reveals a very small ratio of interlayer to intralayer ferromagnetic couplings (J?/J?0.02). Electron spin-resonance data suggest the presence of short-range correlations above TC and confirms the quasi-two-dimensional character of the spin system. A large magnetocaloric effect characterized by isothermal entropy change of -?Sm?31Jkg-1K-1 and adiabatic temperature change of -?Tad?9K upon a field sweep of 7 T is observed around TC. This leads to a large relative cooling power of RCP?284Jkg-1. The large magnetocaloric effect, together with negligible hysteresis render Li9Cr3(P2O7)3(PO4)2 a promising material for magnetic refrigeration at low temperatures. The magnetocrystalline anisotropy constant K?-7.42×104ergcm-3 implies that the compound is an easy-plane-type ferromagnet with the hard axis normal to the ab plane, consistent with the magnetization data.