Abstract: To evaluate the ecological environment of the closed clearance area in the coastal wetland of the northern part of the Yellow River Delta and compare the ecological environment effect between areas with different oil well closure times, oil well clearance areas respectively closed in 2002, 2012 and 2018 were selected. The pollution characteristics of polycyclic aromatic hydrocarbons (PAHs) in surface sediments were analyzed, the sources were analyzed by characteristic ratio method and positive matrix factorization (PMF), and the ecological risk was evaluated by toxic equivalent quantity (TEQ) and mean effects range median (M-ERM-Q) methods. The results showed that the average content in total sediments ΣPAHs was 791.691 ng/g, which was moderately polluted and mainly with 4 to 5 rings. The average content of ΣPAHs in the sediments in 2002, 2012 and 2018 were 587.29, 135.36 and 1 652.41 ng/g, respectively, which were slightly polluted, unpolluted and severely polluted, and the main number of rings were 4-5, 2 and 4-5 rings, respectively. The total sediments PAHs were mainly affected by the oil spill, supplemented by the effects of vehicle emissions, fuelwood, and coal combustion. The main sources in 2002 and 2012 included oil leaks, vehicle emissions, and coal combustion, and in 2002 they also included fuelwood burning. In 2018, the sources included fuel wood combustion and vehicle emissions. The average TEQ of total sediments ΣPAHs was 193.53 ng/g, which fell within the safety range of environmental and human health. The average M-ERM-Q of sediments ΣPAHs in different years was less than 0.1, with low ecological risk, but there was a 30% probability of toxicity at individual points in the closed area in 2018. The restoration effect of sediments in the oil well clearance areas was generally good, but the individual points had high pollution and high probability of toxicity, so further research and ecological restoration were needed.