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The application discloses an L-wave standing wave deflection cavity for low-energy electron beam bunch length measurement and relates to the technical field of electron beam bunch measurement. The application discloses an L-wave standing wave deflection cavity for low-energy electron beam bunch length measurement and relates to the technical field of electron beam bunch measurement. The cavity chain comprises end cavity one, intermediate cavity and end cavity two, the waveguide is arranged on the intermediate cavity through the transition plate, arc-shaped matching grooves are symmetrically arranged at both ends of the transition plate along the axial direction close to one side of the intermediate cavity, the arc-shaped matching grooves are matched with the outer shaft surface of the end cavity one or the end cavity two at the corresponding end, and the slot processing of the end cavity one and the end cavity two is reduced. On one hand, the slotting workload during installation of the deflection cavity is reduced, and the machining efficiency is improved; on the other hand, the combined surface of the waveguide coupler is more fitted, and the brazing is facilitated.