The invention provides a corona discharge device. The corona discharge device comprises a first electrode, wherein the first electrode comprises a general column-shaped first inner cavity part and a general cone-shaped second inner cavity part which is communicated with the first inner cavity part, and the cross section area of the second inner cavity part gradually enlarges on the direction far away the first inner cavity part. The invention further provides an ion mobility spectrometer with the corona discharge device. The ion mobility spectrometer comprises an ionization area and the corona discharge device arranged in the ionization area. The ion mobility spectrometer with the corona discharge device can be favorable for leading-out of ions and can prolong the service life of the electrode. Besides, the electrode is stored by focusing, and thus corona discharge pulse interference can be effectively shielded, and sample ions can be drawn and focused, a designed voltage control scheme is used for realizing migration distinguishing of the ions, meanwhile, ion number fluctuation caused by a corona pulse is shielded, and thus the effect of stable migration of spectral lines is achieved.