The utility model discloses an automatic feeding and discharging mechanism for a roller with a shaft. A vibration disc, a material guiding mechanism and a discharging mechanism are arranged at the upper end of the support. The material guide mechanism comprises a first mounting frame, a vibration frame and a material guide block; the vibrating frame is arranged on the first mounting frame; the material guide block is arranged on the vibration frame; a first inverted convex groove is formed in the material guide block; one end of the first inverted-T-shaped groove abuts against a discharging opening of the vibration disc. The discharging mechanism comprises a second mounting frame, a storage block and a telescopic air cylinder. The storage block is arranged on the second mounting frame; a second inverted convex groove is formed in the storage block; a telescopic cylinder is arranged at one end of the second inverted convex groove; openings are formed in the other ends of the supportingrods, according to the automatic feeding device, the idler wheel with the shaft is conveyed into the material storage block in a mechanical and automatic feeding mode, discharging operation is carriedout by means of the pushing effect of the telescopic air cylinder, labor is saved, conveying efficiency is improved, and conveying precision is high.