The utility model discloses a fuse of a photovoltaic fuse protector. The fuse of a photovoltaic fuse comprises a long-strip-sheet-shaped body. A plurality of breaking holes are arranged in the body in the length direction in order. Breaking sections are arranged on the breaking holes. The width of the residual sheets in the breaking sections is a residence value. The width of the residual sheets inside the breaking sections is set as a residence value, thus the problems are solved that some part sheet width is too short, thus the equivalent resistance is too large, the breaking capacity is too weak, the part fuses first, and thus multiple times of conduction happens because the residual parts of the breaking sections are too many.