In this study, the porphyrin based porous organic polymer, Py-POP, is estimated to be an efficient multifunctional platform integrating adsorption and photocatalysis. For model dyes of methylene blue (MB) and rhodamine B (RhB) which are with same cationic charge and little difference in size, Py-POP exhibits excellent selective adsorption capacity for MB. Furthermore, Py-POP exhibits good photocatalytic ability in the degradation of both RhB and MB/RhB mixture under visible light source irradiation. The adsorption kinetics can be fitted well with the pseudo-second-order kinetic model and the photocatalytic mechanism study reveals that singlet oxygen and hydroxyl radical simultaneously act as reactive species in photodegradation. As a stable, recyclable, multifunctional platform integrating selective adsorption and photocatalysis, Py-POP provides the material basis for novel industrial route design for dye wastewater treatment technique. Our findings highlight an appealing opportunity for porous organic polymers with their potential application as multifunctional platform for efficient dye separation and treatment. Display omitted •Py-POP is estimated to be an efficient multifunctional platform integrating selective adsorption and photocatalysis.•Py-POP exhibits excellent selectivity adsorption capacity for MB and superior photocatalytic performance for RhB.•Further test in the dye mixture model system verified the synergistic effect of adsorption and photocatalysis of Py-POP.•This synergistic effect provides a new inspiration for POPs as multifunctional platforms for dye wastewater treatment.