The invention discloses a device for automatically detecting electric detonators and rejecting waste electric detonators, relating to a device for waste treatment. The invention aims to provide a device for automatically detecting whether electric detonator products are qualified or not and automatically rejecting the unqualified products. The device greatly improves the production efficiency, realizes man-machine isolation operation and has favorable safety. For achieving the aims, the invention adopts the technical scheme: the device for automatically detecting electric detonators and rejecting waste electric detonators is entirely installed on a bracket, the top of the bracket is a detecting table board, one side of the detecting table board is supported by a supporting frame and provided with a detection control device below which a detecting column is arranged, and a lead detecting part is just arranged below the detecting column when a detecting mould for fixing the lead detecting part in a limit fire tube mould is arranged on the detecting table board. The invention can be used for detecting electric detonators and products with similar structures and rejecting waste products.