The present invention relates to a method for producing a porous superabsorbent polymer exhibiting an excellent absorption performance and an improved absorption rate due to a novel porous structure; and a porous superabsorbent polymer produced thereby. The porous superabsorbent polymer comprises: a crosslinked polymer of a water-soluble ethylenically unsaturated monomer having a partially neutralized acidic group and a base resin powder comprising an inorganic filler included in the crosslinked structure of the crosslinked polymer, wherein the base resin powder includes a plurality of pores having a diameter of a sub-micron (μm) scale in the cross-linked structure, and may comprise an open channel type interconnected porous structure in which 90% or more of the plurality of pores are connected to each other.