The invention relates to a detonator exploding device and a detonator without initiating explosives. The exploding device is at least provided with an inner cap filled with trace explosives, and the inner cap is of a cylindrical structure with varying sections; the outside diameter and the inner bore of the cylinder are both of a big-end-up staircase, and the inner bore of the upper cylinder is larger than the outside diameter of the lower cylinder. The inner bore of the shell of the detonator is a big-end-up stepped hole, the outside circular surface of the upper cylinder of the exploding device is tightly matched with the large inner bore of the shell of the detonator, the diameter of the lower cylinder is smaller than the diameter a small inner bore of the shell of the detonator, and explosives are filled into each lower cylinder; the inner bores of the upper cylinders at the uppermost parts of an instantaneous electric detonator and a non-electric detonator are set to be null, andthe inner bore of the upper cylinder and the outside diameter of the delay element at the uppermost part of a delay electric detonator and the non-electric detonator are tightly matched with each other. The exploding device is accurate to position and can be assembled easily, and the exploding device with single-varying section can be assembled into an exploding device with multi-varying sectionsquickly. When used in the detonator, the exploding device has the advantages of multiply magnified energy, strong initiating ability and capability of initiating high-temperature explosives difficultto initiate, and meets the service requirements under different terrible conditions.