The invention relates to a diesel generator control device, and specifically relates to a diesel generator parallel control system. According to the system, the problems that an existing diesel generator parallel control device is high in hardware cost and is relatively complex in software structure can be solved. According to the system, on the basis of a patent 201510461567.3, a power network controller is increased; moreover, hardware such as a power network parameter detection module and two phase detection modules are reduced on a diesel generator controller; moreover, a software control method is correspondingly changed; on the premise of ensuring reliable operation of the system, the hardware cost is reduced; and the control method is simpler.