Automatic welding jig for auger of dough mixer

The invention discloses an automatic welding jig for an auger of a dough mixer. The automatic welding jig comprises a right supporting seat, a left supporting seat, an oscillating cylinder, a driving side connecting disc, a supporting body, a driven side connecting disc, a limiting block, a right pressing point bracket, a right end part pressing device, pressing points, a positioning bolt, a left pressing point bracket, a left end part pressing device and a shape correcting rod, wherein the oscillating cylinder and the supporting body are correspondingly mounted on the left and right supporting seats; the driving side connecting disc and the driven side connecting disc are correspondingly connected with the oscillating cylinder and the supporting body; the two pressing point brackets are correspondingly fixed on the two connecting discs; one corresponding end part pressing device is arranged on each of the two pressing point brackets; three corresponding pressing points are hinged to each of the two pressing