Trivalent lanthanide ions have emerged as promising candidates for precise and remote temperature sensing. Among them, Pr3+-based luminescent thermometers remain underexplored, particularly those operating in the near-infrared (NIR) spectral region. This work presents the synthesis and thorough characterization of a novel Pr3+-based coordination polymer, {[Pr2IIIPt3II(CN)12(4,4'-bpyO2)4(H2O)6]·4H2O}n (1), as a rare example of Pr3+ luminescent thermometry. Coordination between Pr3+ ions, cyanido-bridged Pt2+ centers, and 4,4'-bpyO2 ligands enables efficient energy transfer, producing luminescence in visible and near-infrared regions. The polymer demonstrates distinct temperature-dependent luminescence over a wide range (12-386 K), with relative thermal sensitivities of ≅1%·K-1 and a minimum temperature uncertainty of 0.2 K.