In the present invention is provided a positive electrode active material for a secondary battery, wherein the positive electrode active material includes a core including a lithium composite metal oxide, and a surface treatment layer positioned on the surface of the core, and the surface treatment layer includes a porous coordination polymer in which a central metal ion is coordinate-bonded with an organic ligand such that high electrode density may be exhibited when an electrode is manufactured, and consequently, battery properties may be significantly enhanced. Also provided are a positive electrode, which is for a secondary battery and includes the positive electrode active material, and a secondary battery.