In this paper Sb₂O₃ nanoparticles are synthesized by solution method. The effect of these nanoparticles on the Bi-2223 superconductor properties has been investigated. The critical temperature, critical current density and activation energy were measured by the standard four-probe method. Magnetic properties of the samples were measured by using the AC magnetic susceptibility. The microstructure and morphology of samples have been studied by X-ray diffraction, scanning electron microscope and energy dispersive X-ray. The results of X-ray diffraction patterns show that the low amount of Sb₂O₃ and long annealing time enhance the fraction of Bi -2223 phase. Also the results show that the Sb₂O₃ nanoparticles do not change the phases and critical temperature of Bi-2223 superconductor, but by increasing the amount of Sb₂O₃ nanoparticles, the critical current density and the activation energy of the samples increase.