The present invention provides a multifunctional rechargeable heat preservation lunch box, including an inner box, an outer box, a rice basin, and an upper cover, where the inner box is fixed on the outer box, the rice basin is placed in the inner box, and the upper cover and the inner box are detachably mounted; a battery is arranged at the bottom of the outer box, a waterproof display screen, a PCBA, and a waterproof sealing cover are mounted on a side edge of the outer box, a heating plate and a heat insulation sheet are mounted at the bottom of the inner box, and the PCBA is electrically connected to the display screen, the heating plate, and the battery. According to the present invention, a plurality of problems existing in a traditional heat preservation lunch box are solved.