The invention discloses an unmanned intelligent interlocking device, a method and a system of a coal tower and a coal charging car. The device comprises a coking furnace body, a coal charging car anda coal tower, wherein an interconnection slide gate is arranged at the lower end of the coal tower; one end of the interconnection slide gate is connected with a steel wire rope; the steel wire rope is connected with a counterweight block with a limit; a code reader is mounted on one side of the lower end of the coal charging car; a limit switch is mounted on the other side of the coal charging car; rolling wheels of the coal charging car are embedded into a coal charging line rail on the coking furnace body; the coking furnace body is provided with a code card at an inlet of the coal chargingline rail; the device is matched with a DCS (distributed control system) unit, a coordination PLC (programmable logic controller) system unit and a coal charging software system unit for control; thecoal tower and the coal charging car are automatically interlocked; the traditional technology of allowing raw coal to enter the coal charging car from the coal tower is full automaticity and intelligent; great convenience is brought to coking furnace production; at the same time, unfilled corners and plugging of coal charging are effectively avoided; an effective coal charging quantity is increased; an operation environment of a worker is improved; the coal charging time is shorted; and a coke yield is increased.