The embodiments of the application provide a high-voltage interlock device and a fault detection method thereof. The circuit includes: a first signal detection circuit, configured to collect a first original electric signal from a high-voltage interlock component under detection and convert the first original electric signal into a first sampled signal while ensuring that the high-voltage interlock component under detection is isolated from a fault diagnosis module; a second signal detection circuit, configured to collect a second original electric signal from the high-voltage interlock component under detection and convert the second original electric signal into a second sampled signal while ensuring that the high-voltage interlock component under detection is isolated from the fault diagnosis module; the fault diagnosis module, configured to determine a fault of the high-voltage interlock component under detection according to the first sampled signal and/or the second sampled signal, under a condition that at least one of the first switch module and the second switch module is in an OFF state. The solution provided by the embodiments of the application avoids damage to the controller caused by a large external voltage, and can improve safety of the high-voltage interlock device.
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