The invention discloses a high-precision and wide-range vehicle-mounted DC electric energy meter. The metering accuracy of the present DC electric energy metering device existing in the field of electric energy metering usually ranks at the first level or the second level, the dynamic range of measurement is usually 5 to 10 times, and the maximum current is usually about 200A, which is far from meeting the present requirements. The DC electric energy meter comprises a meter body and a current sampling module and a metering module which are arranged in the meter body. An active filter circuit, a demodulation circuit, a synchronous circuit and an amplification and correction circuit are also arranged in the meter body. The current sampling module is filtered through the active filter circuit and demodulated through the demodulation circuit and then enters the metering module through the amplification and correction circuit. A modulation and demodulation synchronous clock is provided by the synchronous circuit. The DC magnetic modulation technology is used on current sampling of the DC electric energy meter for the first time. Compared with the present DC electric energy metering device, the DC electric energy meter has the advantages of high precision and wide dynamic range and is also suitable for the vehicle-mounted operation environment and the installing environment.