Thermal management system of electric engineering machine and electric engineering machine

The invention discloses a thermal management system of an electric engineering machine and the electric engineering machine, and the thermal management system of the electric engineering machine comprises a refrigerant loop; the first cooling loop comprises a first part needing heat dissipation, a first radiator and a first valve which are communicated in sequence, a first port of the first valve is communicated with the first radiator, a second port of the first valve is communicated with a cooling flow path of the first part needing heat dissipation, and the first valve is configured to be switched between a first state and a second state; the first multi-channel heat exchanger comprises a first channel, a second channel and a third channel, any two of the first channel, the second channel and the third channel exchange heat, one end of the first channel communicates with the first expansion valve, the other end of the first channel communicates with an air suction port of the compressor, and one end of the