Numerous research studies have documented materials exhibiting a significant magnetocaloric effect (MCE) at elevated temperatures. However, there is a scarcity of materials displaying both intriguing MCE and a second-order transition phase from a ferromagnetic state to a paramagnetic state at approximately 300 K. In this current study, we provide an account of the structural, magnetic, and magnetocaloric characteristics of the (Er,Nd)2Fe17 system. (Er,Nd)2Fe17 compound was prepared by arc melting under high pure argon and homogenized at 1073K to minimize the amount of other possible impurity phases. X-ray diffraction (XRD) coupled with Rietveld analysis with FullProf computer code was used for the structural study. This compound crystallizes in the rhombohedral Th2Zn17 and Th2Ni17 type structure.the Er2−xNdxFe17 compounds adopt the hexagonal Th2Ni17-structure type and extends for x = 0, 0.4, 0.7, while for x = 1.75, 1.85 and 2 adopts the rhombohedral Th2Zn17-structure type. Hence, the temperature dependence of the magnetization is determined. The Curie temperature increases from 294K to 335K after the total Er substitution by Nd. The magnetic entropy changes ΔSM, and the relative cooling power and temperature-averaged entropy change (TEC) are reported. Based on these results, the compounds under investigation exhibit an intriguing magnetocaloric effect in the vicinity of room temperature.