A medical gas-liquid supply system including an electrolytic gas generator, a pure water supply device, a control unit, a first gas storing unit, a second gas storing unit and a gas output unit is provided. The control unit is electrically connected to the electrolytic gas generator for controlling the voltage value of the electrolytic gas generator and the type of gases generated by the electrolytic gas generator. The first and second gas storing units are communicated to the electrolytic gas generator for storing the first and second gases generated by the electrolytic gas generator respectively. The gas output unit is communicated to the first and second gas storing units and has first, second and third output ends for outputting the first gas, a mixed gas and the second gas respectively, in which the mixed gas includes the first and second gases.