Low-voltage insulation on-line monitoring device based on small signal injection

The utility model discloses a low-voltage insulation on-line monitoring device based on small signal injection, which comprises a monitor lower shell, a bottom plate fixed at the bottom end of the inner wall of the monitor lower shell, a plurality of sleeves fixed on the upper end face of the bottom plate, compression springs fixed on the inner walls of the sleeves, and inner rods fixed on the upper end faces of the compression springs. A supporting plate is fixed between the upper end faces of the inner rods, the upper end face of the supporting plate is movably connected with a monitoring element plate, and an inserting opening is formed in one side of the upper end face of the monitoring element plate. According to the utility model, the upper shell extrudes the upper end face of the monitoring element plate, so that the upper shell extrudes the supporting plate downwards, the supporting plate extrudes the inner rod and the compression spring at the moment, and the supporting plate is matched with the uppe