The invention discloses a stamping detection mechanism of a stamping-welding line. The stamping detection mechanism comprises a punching device, a stamping switching device, a stamping detection device and a bending flanging device; the punching device, the stamping switching device and the bending flanging device are transversely mounted side by side on the floor in a factory; the stamping detection device is disposed in the front of the stamping switching device; the punching device comprises a base, a tie post, a lock ring, a lock disc, an upper ejector plate, a punching cylinder, a punching check disc, an upper pressure plate, an upper die mounting plate, an upper punching ide, a lower punching die and a punching base plate; the upper pressure plate is provided with the punching cylinder; a piston rod of the punching cylinder is connected with the punching check disc which is fixed to the upper pressure plate; the lower plane of the upper pressure plate is provided with the upper die mounting plate; the upper punching die is fixed to the lower plane of the upper die mounting plate; the punching check disc is fixed to the upper pressure plate; the lower plane of the upper pressure plate is provided with the upper die mounting plate; the upper punching die is fixed to the lower plane of the upper die mounting plate; the upper punching die corresponds to the lower punching die in position. The stamping detection mechanism has the advantages that stamping is stable, product scrap rate is low, and production efficiency is high.