The utility model discloses a transformer substation capable of extinguishing an initial fire, and relates to a transformer substation. The utility model aims to solve the problem that a fire alarm adopted by an existing transformer substation is easy to damage a signal line to cause failure. The box comprises an outer box body and an inner box body, the inner box body is fixed in the outer box body, two inner side walls of the inner box body are both provided with a plurality of groups of symmetrical first functional part slots, and transverse partition plates or transformer substation accessories are embedded between the paired first functional part slots; the inner upper surface and the inner lower surface of the inner box body are respectively provided with a plurality of groups of symmetrical second functional part slots, and longitudinal clapboards or transformer substation accessories are embedded between the paired second functional part slots; the transformer substation accessory comprises a fireproof box, a shell of the fireproof box is provided with a gap, at least one fire extinguishing air bag is placed in the shell of the fireproof box, and incombustible gas and fireextinguishing dry powder are stored in the fire extinguishing air bag. The fire extinguishing airbag structure is adopted, when an initial fire occurs, incombustible gas and fire extinguishing dry powder are released, and then the initial fire is extinguished.