The utility model provides a hyperbaric chamber air discharge fan automatic control device for non -attended substation, relates to an air discharge fan automatic control device, including the control box, is equipped with electrical apparatus control circuit in the control box, and electrical apparatus control circuit includes main circuit and control circuit, and the main circuit is by the three -phase AC power supply, lamp (HL3), circuit breaker (Q), ac contactor (KM1) and the fan motor (M) that connect gradually, and control circuit includes transformer (TC), transformer (TC) secondary end is provided with the ac contactor's (KM1) of the temperature detect switch (t) of series connection and time relay's (SJ) coil, series connection normally open contact and lamp (HL2) and lamp (HL1), and it is parallelly connected with time relay (SJ) coil that the back is established ties to time relay's (SJ) normally closed contact and ac contactor's (KM1) coil, the utility model discloses greatly reduced fortune dimension personnel's working strength, also improved fortune dimension quality, and reduced the air discharge fan power consumption, improved the life of fan.