The utility model relates to a X ray irradiation means for discerning hazardous liquid in parcel. The device is including perspective scanning detecting device, sharp tomoscan detecting device and processing and the control unit. Perspective scanning detecting device scans X ray source and perspective scanning detector including the perspective that is used for acquireing the perspective view of the parcel on the conveyer belt, and sharp tomoscan detecting device is including the sharp tomoscan X gamma ray source and the sharp tomoscan detector that are used for acquireing the tomoscan data of parcel. The device can be surveyed under the condition of not opening the parcel in succession, because sharp tomoscan detecting device's detector adopts the linear array detector group of two -way sparse range, consequently can effectively reduce the detector cost, additionally, the utility model discloses a hazardous liquid's discernment is only carried out in the liquid region in the position of liquid in the perspective scanning location parcel, then it is regional to rebuild liquid through sharp tomoscan, has improved hazardous liquid's recognition speed.