The utility model discloses a multifunctional vacuum flask, which is characterized by comprising an inner flask body and an outer flask body; the inner flask body is disposed in the outer flask body; the inner surface of the bottom of the inner flask body is provided with a temperature sensor; the upper end of the inner flask body is provided with an inner cover; a containing cavity is formed between the outer surface of the inner flask body and the inner surface of the outer flask body; inside of the containing cavity is provided with a power source and a microprocessor module, which is in electric connection with the temperature sensor, and receives and processes signals of the temperature sensor; the outer flask body is covered with an outer over, which is provided with an LED display module embedded therein; and the LED display module is in electric connection with the microprocessor module, which outputs processing results to the LED display module for displaying. With the above-mentioned structure, the multifunctional vacuum flask is capable of displaying the temperature of the water inside directly, and the LED display module can be used for illumination in the night.