Rare-earth-transition-metal intermetallics show very interesting magnetic properties for numerous applications (hard magnetic materials, magnetic refrigeration . . . ). This paper is devoted to the study of the structural, magnetic and magnetocaloric effect (MCE) of the intermetallic nanomaterials PrCo3, which derives from the PuNi3 type structure. This system crystallizes into the rhombohedral structure (R 3m space group). PrCo3 compound exhibits a second order ferro -paramagnetic transition at around 330 K. This 1:3 system, based on a stacked Pr2Co4 and PrCo5 units, has a magnetocaloric effect of 1.3 J/kg K at low field. In addition, we demonstrated that the MCE derived from phenomenological and experimental approaches were in agreement.