To provide a method for purifying a liquid fuel, with which a liquid fuel is purified into a liquid fuel suitable for a fuel cell and a system for purifying a liquid fuel.

Metal removal parts 108-1 to 108-4 remove a metal component from methanol as a liquid fuel stock solution, an ultrapure water supply part 113 adjusts a methanol concentration, purification tanks 110-1 and 110-2 store methanol as an intermediate fuel liquid. Metal removal parts 118-1 and 118-2 remove a metal component from methanol as an intermediate fuel liquid stored in the purification tanks 110-1 and 110-2 to give methanol as a liquid fuel suitable for a fuel cell.