The utility model relates to a mining direct current switch cabinet in the cubical switchboard field, including apron mounting bracket and the pressure -releasing cover board of setting on the apron mounting bracket, be equipped with the ventilation hole on the apron mounting bracket, on apron mounting bracket and/or the pressure -releasing cover board in the top in ventilation hole be equipped with downwardly extending be used for carry out the water -retaining structure that shelters from to the ventilation hole, water -retaining structure is less than the ventilation hole with ventilation hole horizontal spacing and water -retaining structure's bottom. Ventilation hole effluvium can be followed to heat during the use in the cabinet body, when the inside emergence of direct current switch cabinet was unusual, high temperature high -pressure gas washed the pressure -releasing cover board open, prevented the interior hypertonia of cabinet. Drop on direct current switch as dripping cashier's office in a shop the time, the water -retaining structure on pressure -releasing cover board and/or the apron mounting bracket blocks the water droplet, prevents that the ventilation hole on thewater droplet is through pressure relief device from getting into the direct current switch cabinet and causing the incident, compare in prior art, mining direct current switch cabinet's protection level is higher, can be applicable to special occasions such as mine.