Online leaking stoppage equipment for tubular air pre-heater

The utility model discloses on-line leaking stoppage equipment for a tubular air pre-heater, which relates to the technical field of leaking stoppage of air pre-heaters and comprises an air duct, an air pre-heater pipe, a primary air pipe, a secondary air pipe, a conveying pipe and a first valve. A plurality of air pre-heater pipes are arranged on one side of the bottom end of the air channel in a penetrating mode, a primary air pipe and a secondary air pipe are arranged at the top end of the air channel, a conveying pipe used for conveying leaking stoppage glue and filler is arranged on the other side of the bottom end of the air channel in a penetrating mode, a first valve is arranged between the air channel and the conveying pipe, and the two communicating ends of the first valve are connected with an outlet of the conveying pipe and the air channel respectively. When leaking stoppage is carried out, the leakage position does not need to be judged, the filler can be automatically plugged to the leakage poi