Diesel engine tachometer power supply device for power plant

The utility model discloses a diesel engine tachometer power supply device for a power plant, and the device comprises a connecting assembly which comprises a main power line and a standby power line disposed at one side of the main power line. And the switching assembly is arranged on one side of the main power line and the standby power line and comprises a box body arranged on one side of the main power line and the standby power line, a main power supply access module arranged in the box body and a standby power supply access module arranged on one side of the main power supply access module. The device solves the problems that in the prior art, when a station section loses power, a UPS needs to work normally to ensure normal display of a tachometer and starting of a diesel engine, and once the station section loses power and the UPS fails, the tachometer does not display and the diesel engine cannot be started normally, so that all station section power supply equipment such as a TSI system and an ETS sy