Disclosed is a grid for a bipolar plate. The grid comprises an insulating substrate and lead bars passing through the insulating substrate to electrically conduct active materials at two sides. A periphery of the insulating substrate is provided with through holes for the lead bars to pass through. Heat-sealable films sealing the through holes are provided on two side surfaces of the insulating substrate. Middle portions of the heat-sealable films are provided with openings to allow the lead bars to be at least partially exposed to and in contact with the active materials. Insulating bezels covering and concealing regions of the through holes in the insulating substrate are provided at outer sides of the heat-sealable films. The insulating bezels enclose and form a cavity accommodating the active materials. The grid of the present invention separates functional requirements of grids for bipolar plates, and uses lead bars, insulating substrate, and heat-sealable film to achieve respective functions, such that each component only needs to meet a material requirement for the function to be performed by itself, achieving a grid having superior comprehensive performance. The invention lowers material requirements, thus lowering costs, and improves the effectiveness of seals, the binding capacity of active materials, and the like.