Abstract: Provided is a multifunctional vehicle-mounted refrigerator with a plug-in battery, which includes a refrigerator box, an openable cover, a refrigerating chamber and a freezing chamber arranged side by side in the refrigerator box, a compressor installed at the bottom of one side of the refrigerator, a roller arranged at one end of the bottom of the refrigerator box, and a telescopic pull rod arranged at the other end. A battery chamber is defined in one side wall of the refrigerator box, and a battery can be inserted into the battery chamber. The battery includes a battery box and a battery cover. Laterally movable buckle plates are symmetrically arranged between two ends of the battery cover.