Connecting device in coiler system on heating surface of boiler

The utility model relates to a connecting device in a coiler system on a heating surface of a boiler. The connecting device comprises waist-hole steel plates, U-shaped plates, a connecting plate, tightening latches and coilers. The connecting device is characterized in that the two waist-hole steel plates are welded on the two adjacent coilers, the U-shaped plates sit on the waist-hole steel plates with the holes being opposite to each other, the tightening latches are inserted into the two holes, the U-shaped plates and the tightening latches are welded into a whole, and the connecting plate is inserted into the two U-shaped plates and is welded. The connecting device has the advantages of simple structure, low cost and maintenance-free performance.