The present invention relates to the technical field of electromagnet excitation. Disclosed is an energy conversion device having a low-temperature coil, comprising a cold source module, a vacuum module, an external energy module, an internal energy module and a connection module; the cold source module is configured to provide a cold source for the vacuum module, the external energy module is configured to be located outside the vacuum module, the internal energy module is configured to be located inside the vacuum module, and the internal energy module and the external energy module are configured to be connected by means of the connection module. The energy conversion device having the low-temperature coil further comprises a refrigerant module, the refrigerant module being configured to be located inside the vacuum module, and the internal energy module being configured to be located inside the refrigerant module. The connection module comprises a power electronic converter, the power electronic converter comprising a large-current unit and a small-current unit, the small-current unit being configured to be located outside the vacuum module, and the large-current unit being connected to the internal energy module by means of a large-current current lead.
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