Substation direct current grounding detecting device

The invention discloses a substation direct current grounding detecting device, and relates to the substation inspection and maintenance technology field. The substation direct current grounding detecting device comprises a case body; a direct current air switch, an input module, an output module, a voltmeter module, and a fixing device, which are disposed in the case body. The voltmeter module comprises a first voltmeter module and a second voltmeter module. The output end of the input module is connected with the input end of the first voltmeter module, and the output end of the first voltmeter module is connected with the direct current air switch. The direct current air switch is connected with the input end of the second voltmeter module, and the output end of the second voltmeter module is connected with the output module. The output module is connected with the fixing device, which comprises a binding post and a fastening bolt, and is used for fixed connection with a testing wire. By adopting the above