The 2017–18 season was once again a disappointment with Marine unable to improve on the previous campaign and ended up finishing in 19th place in the table. Very poor home form once again saw the Mariners win only 6 of their 23 league games at Rossett Park. However the team did do well in the cups reaching the final of the Liverpool Senior Cup. Home advantage at Marine didn't help and 750 fans saw them well and truly beaten 4–0 by Prescot Cables. They also went on a decent run in the FA Trophy beating Whitby Town and Atherton Collieries. They then saw off teams from the division above in FC United and Chorley before a first ever visit to Dover Athletic saw them lose 3–4 against the Conference National team.