The invention relates to an automatic control method for monopole power in a power distributed running mode in DC power transmission engineering. The power distributed running mode refers that DC power is transmitted to two different AC asynchronous power grids by an inversion station; an automatic monopole power control function has a throw-in condition and a withdraw condition, when the function is thrown into, a DC control system is used for switching a power setting value, shutting a power setting value manually set by a running person and selecting a setting value of an automatic running curve of monopole power set by the running person in advance; and the DC control system is used for converting the power setting value selected by the function into a current setting value, a controller is used for controlling the transmission of DC power of the pole according to a current control mode, so that the DC transmission power of the pole is automatically adjusted. With the method proposed by the invention, the transmitted DC power of the pole can be automatically adjusted by each pole according to the automatic running curve of the pole power, two poles are independent to each other and cannot be affected by each other, and the controllability and the high efficiency of running are improved.