Abstract: The number of constituent quark(NCQ) scaling of elliptic flow in heavy-ion collisions is one of the important signals of parton anisotropic degrees of freedom. In this work, we systematically study the \upsilon_2^ of light flavor hadrons as well as its NCQ scaling in p−Pb collisions at 5.02 TeV, with a multiphase transport(AMPT) model. Based on the advanced flow extraction method, the AMPT model calculations provide a good description of the measured transverse momentum(p_\mathrmT^)-differential \upsilon_2^ of mesons but exhibit a slight deviation of the baryon \upsilon_2^. We find that the NCQ scaling is mainly driven by the combination of parton cascade and quark recombination, and also affected by the nonflow contribution and hardronic rescattering. This study provides new insights into understanding the origin of collective-like behaviors in small collision system.