The invention relates to a dynamic heating water fountain system. The water fountain system comprises a cold water tank, a warm water tank, a hot water cup, a control circuit, a detection circuit, a first heating circuit, a second heating circuit and a power switch circuit, wherein the control circuit switches on or switches off the power switch circuit correspondingly according to a received detection signal to control the power supply of the first heating circuit and the second heating circuit, and alternatively controls the first heating circuit or the second heating circuit to operate; the first heating circuit is used to heat the water inside the warm water tank, and the heating power of the first heating circuit ranges between 1,800 and 2,500W; and the second heating circuit is usedto reheat the water inside the hot water cup. The dynamic heating water fountain system of the invention solves the problem of easy scale formation due to too high temperature and can generate hot water of 70 DEG C within 30 seconds with a great flow rate, and heats water inside an outer heating cup, thereby shortening heating time and ensuring that a user can directly see the heating process andis rest assured during drinking; and the whole water fountain system is convenient to clean and descale and has the characteristics of high thermal conversion efficiency, and electricity and energy saving.