The invention discloses a tower bottom drainage and water seal device of a shaft furnace gas scrubber. The device comprises a fixed neck Venturi tube and a hollow scrubbing tower connected with the fixed neck Venturi tube, the bottom of the hollow scrubbing tower is provided with a cone-shaped tower bottom, the upper end of the tower bottom is provided with a first water outlet which is connected with a first U-shaped water seal, the first U-shaped water seal is connected with a first exhaust dispersing pipe and a second exhaust dispersing pipe respectively, the top of the first U-shaped water seal is communicated with a first drain pipe, the lower end of the tower bottom is provided with a second water outlet which is connected with a second U-shaped water seal, the second U-shaped water seal is provided with a third exhaust dispersing pipe, and the top of the second U-shaped water seal is communicated with a second drain pipe. According to the tower bottom drainage and water seal device of the shaft furnace gas scrubber, by means of a three-stage drainage outlet arrangement mode, gas scrubbing water with different dust contents is discharged respectively, and the problems that outlets and pipelines of gas scrubbing water equipment are prone to silt sinking and blocking are effectively solved.