The invention provides a method for fixing a high-flow-velocity laser dye cell optical window sheet and is applied to a design and manufacturing process of a laser dye cell. The method is characterized in that a metal pedestal for fixing the laser dye cell window sheet is composed of such portions as a liquid inlet end, a contraction area, a work area, an expansion area, a liquid outlet end and the like so that negative pressure is conveniently formed in the work area. The dye cell window sheet is adhered to and sealed on the metal pedestal through an elastic solvent-resistant sealant. By use of a pressure difference between the atmosphere and a fluid when a high-flow-velocity laser dye pool works, the dye cell window sheet is firmly fixed on the metal pedestal. A laser window sheet protection frame is directly fixed on a dye cell metal framework through a connecting leg so as to prevent the laser window sheet from damage caused by external bumps. The method for fixing the dye cell window sheet, provided by the invention, can completely replace a conventional quartz fusion method and a clamping sealing method for fixing the high-flow-velocity laser dye cell window sheet, and can reduce the manufacturing and operation cost while such problems of deformation of the laser window sheet, stress birefringence and the like are avoided.