In this study, we have fabricated a sodium alginate-based redox-responsive, and cancer cell-targeted specific microgel using a water in oil (w/o) mini emulsion process and characterized it accordingly. Initially, we synthesized folic acid (FA)-grafted sodium alginate (SA), a biocompatible polysaccharide, followed by the preparation of a semi-interpenetrating polymer network (semi-IPN) microgel by crosslinking polyacrylamide (PAAm) with a disulfide crosslinker. The presence of disulfide linkages in the microgel formulation accelerated the release of the anti-cancer drug Doxorubicin (DOX) in the reducing domain of cancer cells (in vitro) (cumulative drug release amount 11 ± 3 %). Folic acid was incorporated into the microgels to enhance its targeting towards cancer cells due to the presence of the folate receptor on cancer cells. MTT (3-(4,5-dimethylthiazolyl-2)-2, 5-diphenyltetrazolium bromide) assay showed an IC50 of ∼30 μg/mL of the DOX-loaded microgels towards breast cancer cells (MDA-MB-231) and a nontoxic behaviour towards normal mouse fibroblast cells (L929). FACS (Fluorescence-Activated Cell Sorting) and cell uptake studies showed significant cell apoptosis upon application of the drug-loaded microgels. In our opinion, this type of microgel can be a potential drug delivery vector for cancer treatment.