Radiator, separator and lamp using same

According to the radiator, the separator and the lamp applying the radiator, the radiator comprises a shell surrounding a central axis, a first opening end, a second opening end and a containing cavity, the shell is provided with the first opening end and the second opening end which are opposite to each other along the central axis, and the containing cavity is communicated with the first opening end and the second opening end; the shell comprises a first part and a second part which are arranged along the central axis, and the first part comprises a plurality of device setting parts which are arranged around the central axis; the second part comprises a fin structure which comprises an outer fin set arranged around the central axis and located in the peripheral area and an inner fin set located in the inner area. The first part is closer to the first open end than the second part, and the outer fin group extends towards the second open end; the inner fins and the outer fins extend towards the central axis i