Power generator car and power supply system thereof

The utility model provides a power generator car and a power supply system thereof. The power supply system comprises a first power generator set, a second power generator set and a first selector switch, wherein the first selector switch is used for enabling the connection between an output line of the first power generator set and a public output line under a first state and enabling the connection between an output line of the second power generator set and the public output line; and the power of the first power generator set is larger than that of the second power generator set. The power supply system is internally provided with two power generator sets and the first selector switch; because the power of the first power generator set is more than that of the second power generator set, the first power generator set is operated to supply electric energy to external equipment consuming more electric energy, and the second power generator set is operated to supply electric energy to external equipment consuming less electric energy; and the two power generator sets are used alternatively so as to meet different requirements, and thus, energy sources are saved.