The invention relates to a composite crusher for crushing scrap ammunition. The composite crusher comprises a composite pulverizer mounted on a support frame, wherein the composite pulverizer comprises a feed hopper, an outlet of the feed hopper is connected with an inlet of a knife pulverizer, a first discharge port of the knife pulverizer is connected with a feed port of a screen hammer type pulverizer, the knife pulverizer is driven by a first motor, a cutting knife in the knife pulverizer is driven to rotate by the first motor, the screen hammer type pulverizer is driven to rotate by a second motor, a hammer in the screen hammer type pulverizer is driven to rotate by the second motor, a material is discharged from a second discharge port of the screen hammer type pulverizer through a screen after being pulverized, and a cooling water inlet pipe is arranged on the feed hopper. According to the composite crusher provided by the invention, rod-shaped or strip-shaped scrap ammunition can be crushed, and the disposal and reuse of the scrap ammunition are then realized.