The invention relates to a double-layer-flow purification working table which comprises an air intake system and an air discharging system, wherein an air diffusion plate is arranged below the air intake system; a working chamber is arranged below the air diffusion plate; large holes are formed along the transverse direction on the front side of the air diffusion plate; small holes are formed along the transverse direction at other parts of the air diffusion plate; the air discharging system comprises an air collecting plate which is positioned inside the working chamber and is vertically arranged; the holes in the air collecting plate are increased gradually from top to bottom; an air collecting hood is installed on the outer side of the air collecting plate; the lower part of the air collecting hood is connected with an air discharging device through an air discharging tube; the air flow inside the working chamber is collected by the air collecting hood after horizontally passing through the air collecting plate and is discharged out by the air discharging device through the air discharging tube. By adopting a mutation hole mode, two positive pressure areas are formed at the working chamber, wherein the air pressure on one side close to working personnel is greater than the air pressure on the inner side; the air discharging system is put on the inner side of the working chamber; and by adopting a gradual change hole mode, the air flow inside the working chamber is collected by the air collecting hood after horizontally passing through the air connecting plate, and the phenomenon that the air flow rebounds below the working chamber is avoided.