Provided is a pure phase object imaging system based on photon orbit angular momentum, belonging to the technical field of quantum information and solving the problem of difficult imaging of pure phase objects in a conventional imaging system. The pure phase object imaging system includes a laser, a BBO crystal, two lenses, two filters, a spiral phase plate, a spatial light modulator, two single photon detectors, two data acquisition cards, an associated measurement circuit and a control terminal. The system analyzes the imaging process of the pure phase object on the basis of the photon orbit angular momentum entangled state, divides the generated entangled photon pair into two paths, places an all-phase object in one path which is the signal optical path and the other is an idle optical path, and can recover the intelligible image of the pure phase object by means of the correlation algorithm by recording the correlation count of the two optical paths. The system is suitable to be applied to the non-localized pure phase object imaging in the military, medical, astronomy and search and rescue fields.