The riveting mechanism comprises a rotating disc, the back face of the rotating disc is used for being connected with an index plate, and a mounting hole is formed in the front face of the rotating disc; The sleeve is arranged in the mounting hole, and a first stop flange is inwards formed on the edge of an opening, deviating from one side of the index plate, of the sleeve; A stop boss is arrangedat the end, facing the index plate, of the riveting pressing column in a protruding mode, and a riveting hole is formed in the end face, deviating from the index plate, of the riveting pressing column; The elastic piece is connected outside the riveting pressing column in a sleeved mode, one end of the elastic piece abuts against the first stop flange, and the other end of the elastic piece abutsagainst the stop boss. One end of the top column is connected with the driving device and driven by the driving device to move towards the riveting pressing column or driven by the driving device tomove away from the riveting pressing column. The riveting mechanism is convenient to operate and high in automation degree.