The invention relates to a fish tank control system with the sterilization, cleaning and oxygenation functions, and belongs to the technical field of fish tank waste water utilization. The fish tank control system comprises a fish tank, a sterilization filter, a control chip, a cleaner, an oxygenator and a standing chamber. A coarse filtration layer, a fine filtration layer, an adsorption layer and a sterilization chamber are arranged on the sterilization filter. A mixer is arranged on the inner side of the bottom of the sterilization chamber. An ultraviolet generator, an alum containing box and an ozone generator are respectively arranged on the outer side of the sterilization chamber. The control chip is connected with a blow-off pipe electromagnetic valve, the mixer, an ultraviolet electromagnetic switch, an ozone electromagnetic switch, an alum containing electromagnetic switch, an air pump, a one-way electromagnetic valve, a cyclotron motor, a first water pump and a second water pump. By the adoption of the fish tank control system, waste water can be filtered, sterilized and disinfected, water circulation can be automatically controlled, the fish tank can be automatically cleaned and oxygenated, the goals of recycling water and increasing the oxygen content in water are achieved, and the fish tank control system is high in sterilization speed, good in sterilization effect and convenient to use.