Device and method for purifying and sterilizing swimming pool water

The invention provides a device and a method for purifying and sterilizing swimming pool water, and relates to water treatment. A swimming pool, a water circulation pump, a nano catalytic micro electrolysis tank and a filter are arranged. The water inlet of the water circulation pump is connected with a swimming pool water circulation port; the water outlet of the water circulation pump is connected with the water outlet of the micro electrolysis tank through one water outlet of a tee; the water outlet of the micro electrolysis tank is connected with the water inlet of the filter; the other water outlet of the tee is connected with the water inlet of the filter; and the water outlet of the filter is connected with the swimming pool water inlet. Through a water taking pump and the tee, a part of the swimming pool water is input into the micro electrolysis tank to be catalyzed and micro-electrolyzed and enters the filter through a water outlet of the micro electrolysis tank; and the other part enters the filter and is mixed with the micro-electrolyzed water, strong oxidizing substances generated by catalytic micro-electrolysis are utilized to kill algae, microorganism and viruses in the swimming pool water and make suspended solids, colloids, bacteria and the like form bigger grains, the filter filters to remove the bigger grains, and then the sterilized and purified water is obtained.