NOVELTY - A fuel flow board (10) comprises a substrate having a first surface (101), a second surface (102) and a fuel flowing channel individually disposed on each surface in form of a concave flow-guiding structure. The first and second surfaces are contacted with an upper fuel cell board and a lower fuel cell board. The fuel flowing channel on each surface includes several trenches (103d) defined in parallel. The trenches are disposed corresponding to membrane electrode assemblies of upper and lower fuel cell boards. The trenches are spaced apart and interlaced on first and second surfaces.    USE - For fuel cell.    ADVANTAGE - The fuel flow board of a fuel cell includes deeper channels and a particular cross-section of the channels to minimize the effect of surface tension. The fuel flow board of a fuel cell comprises a channel-separating structure, which is advantageous to the module and fabrication of a fuel flow board.    DETAILED DESCRIPTION - A fuel flow board (10) comprises a substrate having a first surface (101), a second surface (102) and a fuel flowing channel, where the fuel flowing channel is individually disposed on each surface in the form of a concave flow-guiding structure. The first surface and the second surface are respectively contacted with an upper fuel cell board and a lower fuel cell board. The fuel flowing channel on each surface includes several trenches (103d) defined in parallel, the trenches are disposed corresponding to membrane electrode assemblies of the upper fuel cell board and the lower fuel cell board. The trenches are spaced apart and interlaced on the first surface and the second surface. The fuel flow board is sandwiched between the upper fuel cell board and the lower fuel cell board, each fuel cell board includes at least a membrane electrode assembly (MEA).    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of the fuel cell.    fuel flow board (10)    fuel cell board (20)    first surface (101)    second surface (102)    trenches. (103d)