The utility model provides an L-tryptophan extraction device. When the L-tryptophan extraction device is used for obtaining the L-tryptophan by the following steps: heating for sterilization, regulating acidity, the filtering with a tubular ultrafiltration membrane to obtain filter clear liquor and filter concentrated liquor, carrying out evaporation and concentration and crystallization on the filter clear liquor obtained through the ultrafiltration membrane to obtain L-tryptophan crystals and crystallization mother liquor, dissolving the L-tryptophan crystals and filtering and decolorizing through a wound type ultrafiltration membrane, and performing evaporative concentration, crystallization and drying on the decolorization liquor subjected to the wound type ultrafiltration membrane to obtain L-tryptophan. According to the L-tryptophan extraction device, the extraction of tryptophan can be simplified, the purity of the product L-tryptophan is improved, the utilization rate of the product and byproducts can be increased, and the pollution of production waste liquor and the like to an environment can be reduced. The extraction device has certain economic benefits and environment benefits.