The invention discloses a method for filling a static bed with saw dust to adsorb azo dye and belongs to the technical field of waste water treatment. The static bed is filled with saw dust so that azo dye can be adsorbed. The three main steps of pre-treatment, column packing and adsorption are included. Saw dust is dried, smashed and swelled, and an organic glass column is filled with the saw dust. After filling, the certain-height-diameter-ratio static bed filled with the saw dust is formed through standing and water washing. Azo dye waste water enters from the top of the static bed and flows out of the bottom of the static bed. An adsorption region gradually moves to the bottom outlet end till the adsorption region reaches an adsorption breakthrough point, and then adsorption operation ends. According to the method, saw dust is developed as a biological adsorption agent, the static bed filled with the saw dust is formed, multi-stage adsorption balance can be achieved based on the static bed, the adsorption capacity of the saw dust on azo dye is improved, adsorption performance is excellent within a wide pH, salt concentration and dye concentration range, and the method has the advantages that operation is easy and convenient, cost is low, and no secondary pollution is generated.