We present optical photometric and spectroscopic observations of the low-luminosity (LL) Type IIP supernova SN 2024abfl. The distance to its host galaxy is highly uncertain, with independent estimates of 9.5^(+2.3)_(-2.4) Mpc and 15.0^(+8.9)_(-1.9) Mpc. Even adopting the larger distance, the inferred plateau luminosity is only ∼ 10⁴¹rm erg s⁻¹, placing SN 2024abfl at the extreme faint end of SNe IIP population. Its light curve exhibits a long-lasting plateau of approximately 110 days. The spectra show exceptionally low expansion velocities, with the FeII velocity of ∼1200 rm km s⁻¹ at 50 days after the explosion, significantly lower than the typical values of ∼2000-5500 rm km s⁻¹ observed in SNe IIP, placing SN 2024abfl among the slowest-expanding LL SNe IIP. Bolometric modeling yields a synthesized ⁵⁶Ni mass of ∼0.002-0.004 rm M_⊙, though this estimate remains subject to significant uncertainty owing to the poorly constrained distance. Considering the plateau color and duration, the magnitude drop from plateau to tail, and the progenitor luminosity, we favor a low-mass core-collapse origin for SN 2024abfl.