This systematic literature review aims to study the thermal properties (TP) of poly(acrylic acid)-based hydrogels (PAA) by differential scanning calorimetry. The data sources were obtained from Google Scholar via Publish or Perish software from 2018 to 2020. The synthesis results show that most of the analysis of TP in PAA-based hydrogel consists of glass transition temperature ([Formula: see text]), melting temperature ([Formula: see text]), and enthalpy ([Formula: see text]). The subsequent thermal properties analysis is important for a new development and depth study in the future application.