The utility model provides a boats and ships LNG supply of fuel system relates to liquefied natural gas technical field. The utility model provides a pair of boats and ships LNG supply of fuel system, include: the storage tank, with the place is connected to the filling unit is connected, is placed alone to the storage tank filling piping, with the air feed piping junction institute of air feed unit is connected, is placed to the storage tank. The utility model provides a boats and ships LNG supply of fuel system neither influences when making the air feed unit break down, can mutually support again, guarantees independent, the safe and reliable of air feed, and convenient maintenance.