The invention provides a garment steamer with a power-off temperature prompt function. The garment steamer comprises a main unit, a conduit and a steamer head, the steamer head is connected with the main unit through the conduit and comprises a base plate, a
heating element, a temperature measuring element and a temperature prompting unit, and the garment steamer further comprises a main power source for supplying power to the main unit, the
heating element, the temperature measuring element and the temperature prompting unit; the
heating element is installed on the base plate and heats the base plate, the temperature measuring element is arranged on the base plate and is used for measuring the temperature of the base plate, and the temperature prompting unit is connected with the temperature measuring element; the garment steamer further comprises
storage energy for supplying power to the temperature measuring element and the temperature prompting unit, and a power source switch control module is connected between the
storage energy and the main power source. When the main power source is switched off, the
storage energy is started through the power source switch control module, it is ensured that the temperature measuring element and the temperature prompting unit normally work, a user can know the current temperatures of the base plate of the steamer head in real time through the temperature prompting unit, it is ensured that after the garment steamer is power off, the temperature of the steamer head can be displayed or warned, and the safety performance of the garment steamer is improved.