A control system for a work machine, said control system being equipped with: a split flow fluid pressure pump that discharges a working fluid from a first discharge port and a second discharge port; a connection switching valve, which is switched by a switching signal when a first operation valve or a second operation valve is switched, thereby connecting a first intermediate passage and a second intermediate passage; an intermediate cut valve, which is switched by the switching signal and thereby blocks a connection to a tank from the intermediate passage for which the operation valve has not been switched, that is, from the first intermediate passage for which the first operation valve has not been switched or from the second intermediate passage for which the second operation valve has not been switched; and a discharge flow volume adjustment device which, when the switching signal has been input from the first operation valve or the second operation valve, adjusts the discharge flow volume from the fluid pressure pump so as to reduce the discharge flow volume.