The invention provides an elbow screening device. The elbow screening device comprises a material guiding strip and a first detection mechanism. The material guiding strip is provided with a materialguiding groove, and the material guiding groove is used for enabling elbows arranged by an elbow arranging mechanism to sequentially enter the material guiding groove. The first detection mechanism comprises a first conductive metal sheet, a second conductive metal sheet and a current detection component, wherein a potential difference exists between the first conductive metal sheet and the secondconductive metal sheet. When the elbows move to a first preset position of the material guiding groove along the material guiding groove, sleeving rings sleeving the two end head portions of the elbows make contact with the first conductive metal sheet and the second conductive metal sheet correspondingly, so that a closed conductive loop can be formed by the first conductive metal sheet, the second conductive metal sheet, the current detection component and the elbows to form current on the current detection component. Therefore, whether the sleeving rings sleeving the two end head portionsof the elbows are missed or not can be determined according to whether current flows through the current detecting component or not. The elbow screening device solves the problem that a screening mechanism in the prior art cannot be used to screen missed elbow sleeving rings.