The utility model relates to a device for improving oil supply reliability of a generator set lubricating oil system. The device is characterized in that in control logic of a distributed control system (DCS) of the generator set lubricating oil system, 2-5-seconds of delay is additionally increased for a safety protective section when low voltage associates with tripping, 1-2 seconds of voltage loss of the AC lubricating oil pump during switching of a power supply switch of the safety protective section is avoided, tripping of the AC lubricating oil pump during switching of the power supply switch of the safety protective section does not occur; under the condition that the starting hardwire is associated with a DC lubricating oil pump, a low voltage instant interlocking start condition for the safety protective section is set, and the low voltage instant start condition for the safety protective section is set as malfunction of the AC lubricating oil pump in the interlocking logic of the DC lubricating oil pump, therefore, that oil pressure can be provided by the DC lubricating oil pump during short-time voltage loss of the power supply switching busbar of the safety protective section can be ensured. According to the device for improving the oil supply reliability of the generator set lubricating oil system, the oil supply reliability of the generator set lubricating oil system can be improved from two aspects, the reliability is high, the benefit that normal oil supply of the lubricating oil system under the situations of low voltage of the safety protective section and malfunction of the AC lubricating oil pump can be ensured.