The invention discloses a power distribution method for diesel generator sets of a DC network power generation system. The method comprises the steps of (a) setting the priorities of the diesel generator sets, and inputting the power parameters of the respective diesel generator sets into a main control module; (b) enabling the power generation system to operate, setting the rectification parameter of a rectification power module to keep a rectified voltage value between Vmin and Vmax, and enabling the main control module to start the diesel generator sets Di according to the set priorities i;(c) transmitting the AC IACi generated by the diesel generator sets Di and the rectified DC voltage values VDCi to a sub-control module to calculate the used power pi of the current diesel generator;(d) enabling the main control module to control the acceleration, the deceleration and the start-stop states of the diesel generator sets by using a ratio of the used power pi to the rated power Pi;(e) enabling the sub-control module on each circuit to adjust the used power pi of the diesel generator sets so that the difference of the used power pi' of respective circuits is within a coarse; and(f) enabling the main control module to perform power fine adjustment until the difference of the power of respective circuits is within a fine.