The invention discloses a discharge filtration device of an ethylene-vinyl acetate (EVA) film extruder. The discharge filtration device comprises filter screens, a feeding pipe and a discharging pipe. A filter screen installation position is arranged between the feeding pipe and the discharging pipe. The discharge filtration device is characterized in that the discharge filtration device also comprises a screen storage barrel and a screen reeling mechanism, wherein the screen storage barrel and the screen reeling mechanism are located respectively at two sides of the filter screen installation position; a filter screen roll composed of the multiple filter screens connected with each other is arranged in the screen storage barrel; a screen outlet opening is arranged at the screen storage barrel located at a filter screen installation position side; the screen reeling mechanism comprises a support and a reel shaft; an end of the filter screen roll passes through the screen outlet opening and is connected to the reel shaft by the filter screen installation position; and the reel shaft is rotatingly connected to the support. Through the screen storage barrel and the screen reeling mechanism, the reel shaft can rotate, and the discharge filtration device realizes replacement of the filter screens, is convenient for operation, and avoids closing down and pollution produced by dust and impurities on raw materials.