The invention discloses a louver vibration screening device, and relates to a screening system in a tobacco threshing redrying factory. The louver vibration screening device comprises a vibration groove body. Fixed sliding rails are arranged on the front side and the rear side of the vibration groove body, space adjusting sliding rails are arranged above the fixed sliding rails on the two sides of the vibration groove body respectively, and sliding grooves are formed in the opposite sides of the vibration groove body and the space adjusting sliding rails. W-shaped supporting structures are arranged between the fixed sliding rails on the two sides and the space adjusting sliding rails, and the W-shaped supporting structures are connected with louver blades. Angle adjusting sliding rails are arranged on the vibration groove body and located above the space adjusting sliding rails on the two sides respectively, sliding grooves are formed in the opposite sides of the angle adjusting sliding rails, the two ends of each louver blade are connected with angle adjusting shafts, and the other ends of the angle adjusting shafts are arranged in the sliding grooves of the angle adjusting sliding rails in a sliding mode respectively. According to the louver vibration screening device, the angles and the spaces of louvers can be adjusted according to the technological requirement, so that the optimum screening effect is achieved, threshed oversized leaves are screened out to be subjected to secondary treatment, and therefore the technological requirement can be met.