The invention discloses an automatic discharging mechanism. The automatic discharging mechanism comprises a lifting module, a rotating module and a holding module for bearing materials. The rotating module and the holding module are both arranged on the lifting module. The lifting module is used for driving the rotating module and the holding module to ascend and descend. The holding module can rotate at a certain angle under the driving with the rotating module. By means of the automatic discharging mechanism, the step that workers stretch hands into a machine table to take materials can be omitted, the possibility that misoperation causes injuries to the human body is avoided, and welded materials can be collected as long as workers stay in a safe area.