The current equalizing device as one distributed DC source system includes a voltage error amplifier and a current equalizing controller. In the current equalizing controller, resistor R9 and capacitor C3 are connected parallelly between the inverse input and the output of the op-amp; R10, R11 and + 5V power source constitute a bias circuit connected to the non-inverse input of the op-amp; and R9, R10 and R11 meet the expression of R10+R11=2R9. The current equalizing device is simple, easy to design and debug; can realize the two-way regulation based on average current; has high precision in full load range; may be used in various switching circuit for outputting DC voltage.