Fire-fighting spray header leaking stopper

The invention belongs to the technical field of fire fighting, and particularly relates to a fire-fighting spray header leaking stopper, which consists of a butterfly screw cap, a hemispheroidal sealing member, a U-shaped clamp manufactured by an upper L-shaped support sheet and a lower L-shaped support sheet, a screw, a plate and a wedge-shaped block. In the fire-fighting spray header leaking stopper, the wedge-shaped block is pushed in the U-shaped clamp which consists of the upper L-shaped support sheet and the lower L-shaped support sheet, so that the U-shaped clamp is expanded outwards, the hemispheroidal sealing member adhered to the upper part of the upper L-shaped support sheet just blocks a water injection nozzle of a spray header, and the wedge-shaped block is pushed towards the inside of the U-shaped clamp continuously with the continuous screwing of the butterfly screw cap until water does not leak from the water injection nozzle of the spray header. The fire-fighting spray header leaking stopper