The utility model relates to the field of fire fighting technology, and in particular to a quick-connect device for a fire hydrant connector. The outer card head is mounted on one side of the water outlet of the fire hydrant, and the inner card head is connected inside the outer card head. The inner card head is provided with a water outlet pipe. A plurality of grooves are formed on one side of the inner card head, and a first spring is arranged inside the grooves. A positioning card is arranged on one side of the first spring, and the positioning card can slide in the groove. A claw is hinged inside the outer card head, and a second spring is arranged on one side of the claw. The second spring is fixed on the outer card head. A positioning slot is formed on the outer surface of the inner card head, and the positioning card can be engaged in the positioning slot. A card slot is formed on the outer surface of the inner card head, and the claw can be engaged in the card slot. A disassembly slot is formed on the outer surface of the inner card head, and the disassembly slot is not on the same straight line as the card slot.