The invention relates to a high-energy
electron irradiation accelerator, which comprises an accelerating structure and a supporting structure, wherein the acceleration structure comprises an electrongun, focusing coils, an input
waveguide system, a load
waveguide system, a beam detection
system and a scanning system, the
electron gun, the focusing coils, the beam detection system and the scanningsystem are connected in sequence and vertically installed on the acceleration structure so as to be convenient to assemble, and the input
waveguide system and the load waveguide system are respectively connected to the inlets and the outlets of the focusing coils. According to the invention, the acceleration structure can guarantee the installation coaxiality in a mode of being vertically installed on the supporting structure, so that the acceleration structure is rapid to install and convenient to install and debug; a large circular hole is designed in the center of the top supporting plate,so that structural accessory hoisting is accelerated during vertical installation; and a
titanium pump supporting plate is adjustable, and the position of a
titanium pump can be finely adjusted according to the actual installation condition, so that the
titanium pump installation process difficulty is effectively reduced, the precision requirement for the installation position of the supporting plate is lowered, and the installation efficiency is improved.