A tooth-brushing cup and heating device consists of a tooth-brushing cup, a hoop, a base and the like an electromagnetic coil, a control circuit and the like are arranged in the base, a display window is arranged at the upper part of the base. Four buttons are arranged above the display window for setting the temperature and the heating time respectively, and a power switch is arranged on the right side of the display window. The hoop is installed on the base, and a conical surface inside the hoop is attached to the outer conical surface of the tooth-brushing cup. The tooth-brushing cup is made of stainless steel by stamping and is in a circular table shape, and a side plane is stamped on the side wall of the tooth-brushing cup to be tightly attached to a base panel.