The invention discloses a snap gauge for inspecting strand blocks of a split conductor. The snap gauge is formed by vertically combining radian board with an arc-shaped groove, and an angle board with an angle groove. According to the snap gauge disclosed by the invention, by adopting the vertically combined structure of the radian board and the angle board, the sector process dimension formed by the arc-shaped groove and the angle groove is equal to the process dimension of each sector strand block; the snap gauge is simple in structure, convenient to carry and use and small in measuring error; the problems that the sector angle, the base angle and the cambered surface of the sector strand block cannot be measured, the measuring error is big, quality cannot be controlled very well, greater waste can be caused by equivalent sampling, dimension variation during production and processing cannot be found in time, and the like are solved.