The invention relates to a collocation method of an ultra high voltage direct-current power transmission controlling system. In the ultra high voltage direct-current power transmission system, each electrode adopts two twelfth pulsating valve blocks which are serially connected, the system/double-electrode/electrode controlling function, the low-pressure valve block controlling function and the high-pressure valve block control function are separated, and a system/double-electrode/electrode device, a low-pressure valve block and a high-pressure valve block device are independently arranged; independent control devices are adopted to finish the system/double-electrode/electrode control and realize the counting and the distribution of a power/current order, the coordination to a current order between a converting plant and an inverting station, the switching control of a powerless device in a convertor station, the electrode direct-current sequential control and the direct-current modulating control of the convertor station and the coordination control function among a plurality of direct-current circuits; each serially connected twelfth pulsating valve block adopts converter valve controlling units which are mutually independent on the physics, thereby the closed-loop control to the direct current, the direct-current voltage and the arc blowout, the unlocking and closedown functions of the valve block, the tap-joint control of a converter transformer that is corresponding to the valve block and the control functions of each bypass switch of the valve block are realized.