Abstract: The object of this invention is a grey water regeneration system for its subsequent reuse which guarantees the quality of the purified water, disposing of sensors which fully control the process by means of an automaton programmed so that if it detects any problem in the system, the water can be evacuated to the general collector (5), and comprises a primary receptor tank (1) of the grey water that gathers to then supply it to the purification system, a secondary tank (11) wherein a biological purification takes place by means of activated sludge which comprise an aerator (14), a membrane (15) and a suction pump (31), and a tertiary tank (19) wherein a disinfection takes place by means of chloride additivation, wherein all of the tanks are connected to the general collector (5).