The invention relates to a persistent organic pollutant removal system based on a constructed wetland. The technical scheme is characterized in that a water outlet of a grille pool (2) communicates with a water inlet of a circulating pump (5) and a water inlet at the lower part of a first cylinder type electrolytic tank (6); a water outlet of the circulating pump (5) communicates with the bottoms of the first cylinder type electrolytic tank (6), a second cylinder type electrolytic tank (7) and a third cylinder type electrolytic tank (8) through a flow circulating pipe (4); the first cylinder type electrolytic tank (6) communicates with one side of the upper part of the underflow type constructed wetland through the second cylinder type electrolytic tank (7) and the third cylinder type electrolytic tank (8); the bottom of the other side of the underflow type constructed wetland is provided with a water drainage port (12). The underflow type constructed wetland is provided with a sand soil layer (16), a bio-ceramsite layer (10) and a gravel layer (9) from an upper layer to a lower layer successively; a solar panel (18) is arranged above the underflow type constructed wetland. The system has the advantages of relatively low cost, simple process, environmental friendliness and high removal rate, and is suitable for removal of persistent organic pollutants.