The invention discloses a method for producing a fiber board and an organic fertilizer by utilizing garden waste. The method comprises the following steps: (1) crushing; (2) softening treatment: after crushing, adding mycetes, and carrying out natural fermentation treatment, to obtain a softened material; (3) solid-liquid separation: squeezing out water of the softened material, achieving the solid-liquid separation, and thus obtaining a concentrated liquid and a solid; (4) carrying out evaporation and concentration on the concentrated liquid, then carrying out slurry-spraying granulation, drying, and thus obtaining the organic fertilizer; (5) carrying out pulp grinding treatment on the solid to obtain a pulp; and (6) concentrating the pulp, then squeezing and dewatering to obtain a paper pulp, and drying to obtain the fiber board. The garden waste is subjected to crushing, softening and solid-liquid separation treatment to obtain the concentrated liquid and the solid, the solid is used for preparing the fiber board, the concentrated liquid is used for preparing the organic fertilizer because of containing a large amount of nitrogen, potassium, organic matters and other nutritional ingredients, and thus cleaning comprehensive utilization of the garden waste is achieved.