A kind of multifunction fish tank control system, including a light control unit, a manual dimming unit, a water temperature heating unit, a water temperature measurement unit, a water quality testing unit, an Auto-drainage and inlet unit, an automatic feeding unit and a display unit. Lighting brightness of the light control unit to detect a fish jar,And the lamplight brightness of the fish jar is adjusted according to the lighting brightness and sends a light controling signal； The hand-operating light unit and the light control unit are electrically connected,To manually adjust the lamplight brightness of the fish jar by personnel； Water temperature of the water temperature measurement unit to measure the water in the fish jar,And a water temperature measurement signal is sent according to the water temperature； The water temperature heats unit and the water temperature measurement unit is electrically connected,To receive the water temperature measurement signal,And the water in the fish jar is heated or not heated according to the water temperature measurement signal； Water quality of the water quality testing unit to detect the water in the fish jar,And a water quality detection signal is sent according to the water quality； The Auto-drainage and inlet unit and the water quality testing unit are electrically connected,To receive the water quality detection signal,And according to the water quality detection signal as a result,Starting or Auto-drainage and the water inlet for not starting the fish jar； The automatic feeding unit to according to the fish in the setting time automatic feeding fish jar,And send an automatic feeding signal； The display unit and the light control unit,The water temperature measurement unit,The water quality testing unit and the automatic feeding unit are electrically connected,To receive the light controling signal,The water temperature measurement signal,The water quality detection signal and the automatic feeding signal,And accordi
