The utility model discloses a vehicle integrated DC power source, comprising a cabinet, and a power source transformation unit, a distribution unit and a monitoring unit arranged in the cabinet. One or more surfaces of the cabinet employ heat sinks; the power source transformation unit comprises one or more power source transformation branch units which are in parallel connection and fixed on inner walls of the heat sinks. The distribution unit is used for controlling on and off of a DC output circuit, is composed of a DC contactor and a relay printing plate and is installed in the cabinet. The monitoring unit comprises a controller and used for monitoring input voltage, output voltage and current of the power source transformation unit and other fault singles in real time; The monitoring unit is also in connection with a host computer through a CAN bus and used for controlling on and off of power source output. The vehicle integrated DC source realizes an integrated function of power source transformation, distribution and monitoring, has the characteristics of reduced equipment size, simple structure and high intelligent degree and can be widely used.