A vehicle-mounted charging device includes a charging main body, an external module, an electric wire, and a lighting module. The charging main body includes a circuit board in a first shell, a power plug, and a first shell. A power socket of a vehicle connects to the circuit board. The external module includes a charging plug and a second shell. The charging plug is arranged in the second shell. The charging plug connects to a charging socket of an electronic device to recharge a battery of the electronic device. The electric wire is configured to electrically connect to the charging main body, the external module, and the lighting module to visually indicate the state of charge of the battery of the electronic device.