In order to abuse the disadvantages of traditional disposal of dangerous ammunitions and adapt to new request of the army, a new type of cumulative detonator for dangerous ammunitions disposal was designed by the experience of cumulative device design and the cumulative effect. Many principles such as the explosive, liner, shell, bursting height were introduced. The test of five types of dangerous ammunition disposal using the cumulative detonator was also carried out. The ammunitions are different in charge, shell and material. It approves that it is feasible to use the cumulative detonator for dangerous ammunitions disposal.