The invention provides a bacterium concentration standard exceeding sterilization system aiming at different people groups. The bacterium concentration standard exceeding sterilization system aiming at different people groups is used in a bathroom, and comprises a bacterium collecting device, a concentration measuring device, a facial image processing device, a concentration judging device and an ultraviolet ray sterilization lamp tube, wherein the bacterium collecting device collects bacteria in the bathroom; the concentration measuring device extracts the collected bacteria, performs relevant concentration measurement, and outputs a measuring result with a concentration threshold; the facial image processing device performs facial image collection on a user entering the bathroom, extracts out facial features of the user in the collected image, performs similarity comparison on the collected facial features of the user with pre-stored images built in a database, and outputs at least one comparison result with a user name after the comparison succeeds; the concentration judging device judges whether the concentration threshold values output by the concentration measuring device exceed the concentration threshold value corresponding to the user name or not, and gives out a control signal if the concentration threshold values output by the concentration measuring device exceed the concentration threshold value corresponding to the user name; the concentration threshold values are set according to the age intervals of the user name, and at least comprise a first concentration threshold value, a second concentration threshold value and a third concentration threshold value which respectively correspond to different age intervals; and the ultraviolet ray sterilization lamp tube starts different stages of sterilization brightness according to different control signals.