The invention discloses a safety fence for maintenance of a low pressure cylinder of a nuclear power plant turbine. The safety fence comprises a plurality of fence frames, a plurality of stand columnsand a plurality of sliding rails, and the fence frames, the stand columns and the sliding rails are made of stainless steel materials. When the safety fences are assembled around the low pressure cylinder, the multiple stand columns are arranged around the low pressure cylinder at intervals, the bottoms of the stand columns are detachably installed at a platform around the low pressure cylinder,each of the fence frames is detachably connected between every two adjacent stand columns, the sliding rails are detachably installed at the top ends of the stand columns, and every two adjacent sliding rails are detachably connected and fixed. The safety fence for the maintenance of the low pressure cylinder of the nuclear power plant turbine is attractive and neat in overall, handy and convenient to erect, and safe to use, the erection materials are not loose, and the safety fence for the maintenance of the low pressure cylinder of the nuclear power plant turbine is convenient for maintenance personnel to hang the safety belt.