The invention discloses a membrane method extraction process for alanine production. A membrane method extraction system for the alanine production comprises a circulating tank, an organic ultrafiltration membrane system, an organic decolorizing membrane system, a filter, a cleaning tank, a material feeding pump, a circulating pump, a booster pump and a pipeline valve system. A pressure gauge, a thermometer, a level gauge and a flow meter are arranged in the overall extraction system, so that the safe and stable operation of the system is monitored and protected constantly; organic ultrafiltration membrane and organic decolorizing membrane combination process production equipment is applied to subsequent sterilization and cleaning processes of alanine fermentation broth so as to monitor and protect the safe and stable operation of the system constantly. The membrane method extraction process is a combination membrane production process which can be used safely and effectively for a long time and is convenient to maintain; the alanine fermentation broth completely meets market requirements after being processed by the membrane method combination production process; meanwhile, the using cost of activated carbon is greatly reduced; the production cost is reduced; direct and obvious economic benefits are brought to enterprises.