A shielding apparatus is provided. The shielding apparatus includes: at least one shielding shell segment, the at least one shielding shell segment constituting a shielding chamber, the shielding chamber being arranged on a periphery of a radiation device and shielding radiation generated by the radiation device. The shielding chamber is arranged on the periphery of the radiation device, and the shielding chamber at least partially shields scattering radiation generated by the radiation device, which can thus reduce the requirements of the radiation device for radiation shielding of a dedicated machine room or get rid of the dependence of the radiotherapy device on a dedicated machine room.