The invention relates to a high-voltage line monitor and a shell of the high-voltage line monitor. The shell comprises a main part, a clamping part and a pressing board installed on the main part. The clamping part is provided with a movable clamping part. The main part is provided with a clamping part opened and closed relative to the movable clamping part. The movable clamping part is movably connected to the main part and provided with a containing cavity used for containing a cable. The pressing board jacks the containing cavity so that the cable can be received, the containing cavity can be loosened when pressed by the cable, and the movable clamping part and the clamping part can be closed. The shell of the high-voltage line monitor is provided with the movable clamping part, the movable clamping part and the clamping part can be movably opened and closed, and through cable triggering operation, a worker does not need to climb onto a high frame for assembly and disassembly, and assembly and disassembly can be achieved on the ground; disassembly is convenient, assembly and disassembly efficiency is greatly improved, and the shell is safer and more reliable. The shell can be assembled and disassembled without power outage and assembly and disassembly cost is greatly reduced.