A working machine control system includes: a split-flow fluid pressure pump configured to discharge a working fluid from a first discharge port and a second discharge port; a communication switching valve configured to allow, when one of a first operation valve and a second operation valve is switched, the first discharge port or the second discharge port for one of the first operation valve and the second operation valve that is not switched to communicate with a first neutral passage or a second neutral passage for the other of the first operation valve and the second operation valve that is switched; and a discharge flow rate adjusting device configured to adjust the fluid pressure pump so as to reduce a discharge flow rate of the fluid pressure pump in a case where a switch signal is inputted from any one of the first operation valve and the second operation valve.