The invention relates to the technical field of manufacturing of artificial fiberboards, in particular to a method for producing a fiberboard containing an ultramicro amount of residual formaldehyde. The method for producing the fiberboard comprises the technological steps of preparation of adhesive, manufacturing of wood fibers, adhesive application, drying, mat formation and pre-pressing, hot pressing and obtaining of a finished product. According to the method, forest logging residues or wood processing residues or bagasse or other materials are used as raw materials for producing the fiberboard, waste materials are changed into valuable things, and full utilization of wood resources is effectively achieved; the adhesive used for producing the fiberboard is adhesive containing only a micro amount of residual formaldehyde, in this way, environmental friendliness and safety are achieved, and the fiberboard has good water resistance and high bonding strength; the fiberboard produced by using the adhesive hardly contains residual formaldehyde and high in binding powder; the content of substances harmful to human bodies is low, the substances harmful to the human bodies hardly exist, and thus harm to the human bodies is reduced; in addition, the internal structure of the board is uniform, the density is proper, the dimensional stability is high, the quality is stable, and the service life is long.