The utility model discloses a wall-mounted type optical cable terminal box of an indoor transformer substation. The wall-mounted type optical cable terminal box comprises a box body and is characterized by further comprising an optical cable inlet, an optical cable outlet, an optical cable connector box and an optical cable residual cable rack, wherein the optical cable inlet and the optical cable outlet are respectively formed in the box body, and the optical cable connector box and the optical cable residual cable rack are respectively fixed into the box body. The wall-mounted type optical cable terminal box of the indoor transformer substation is light in weight and small in size, is convenient for wall-mounted installation, and saves occupied area of the transformer substation; the strength is high, and the device is durable in use; the insulating property is good, thereby facilitating the connection and disconnection of grounding; in addition, rolled steel can be saved for the nation.