Supporting handrail for PC stair

The utility model discloses a PC stair supporting handrail which comprises a mounting base, a mounting block is fixedly mounted in an inner cavity of the mounting base, a supporting rod is arranged in the inner cavity of the mounting base and located at the top of the mounting block, a handrail body is arranged at the top of the supporting rod, through grooves are evenly formed in the bottom of the handrail body, and the through grooves are communicated with the mounting block. Containing grooves are formed in the positions, located on the two sides of the through groove, of the interior of the armrest body, limiting columns are arranged in the containing grooves, and clamping grooves which are evenly distributed are formed in the two sides of the supporting rod. The supporting rod is contained by arranging the mounting base, the armrest body is conveniently supported by arranging the supporting rod, a user is conveniently supported by arranging the armrest body, the top of the supporting rod is limited by ar