The utility model belongs to the technical field of nuclear power plant moving emergency power sources, and particularly relates to a nuclear power plant medium voltage moving diesel-oil electric generator wagon. The nuclear power plant medium voltage moving diesel-oil electric generator wagon comprises a diesel oil engine, a generator, a generator circuit breaker, a starting storage battery and a moving car. The starting storage battery is used for starting the diesel oil engine, the diesel oil engine is connected with the generator through a coupling, the output of the generator is transmitted to an external device through the generator circuit breaker, the diesel oil engine, the generator, the generator circuit breaker and starting storage battery are mounted on the moving car, and nuclear power plant medium voltage moving diesel-oil electric generator wagon is capable of supplying power. In the prior art, a diesel generator can not meet the requirement that a big motor load starting voltage is reduced by 25% or reduced more than 25% when a nuclear power plant is under a power-off condition, however, by means of the nuclear power plant medium voltage moving diesel-oil electric generator wagon, the above technical problem is solved; generator voltage drop caused by motor start is reduced, the requirement that the big motor load starting voltage is reduced by 25% or reduced more than 25% when a nuclear power plant is under a power-off condition is met.