The utility model discloses an automatic switching ball valve mechanism, include: a guide structure, the 2nd guide structure, first pin structure, second pin structure, four handle ball valve structures, wherein, a guide structure, the 2nd guide structure distinguish head end and the end of fixed mounting at transfer base for for the vinasse direction. Transfer base is last to have the transfer link, the head end at the transfer base who has a guide structure is installed in the correspondence of first pin structure, the end at the transfer base who has the 2nd guide structure is installed in the correspondence of second pin structure, four handle ball valve structrual installations are in the exit of vinasse's bottom pipeline. The utility model discloses change the automatic switching that the ball valve is carried out in the cooperation that utilizes four handle ball valve structures and two shelves poles into by traditional artifical switching valve, realized the automatic of alcohol and moisture and discharged, reduced workman's operation intensity, improved fermentation workshop's factor of safety, also improved the work efficiency of transfer link.