The invention discloses a reflecting face supporting assembly for a heliostat and the heliostat comprising the reflecting face supporting assembly. The reflecting face supporting assembly comprises adjusting pieces and bonding pieces. Each adjusting piece comprises a fixing part fixedly connected with a heliostat frame and a bending part extending out from the fixing part. The bonding pieces are fixedly arranged above the bending parts of the adjusting pieces, and fixedly connected with the reflecting face of the heliostat. The bending part of each adjusting piece is at least provided with two bonding pieces. According to the reflecting face supporting assembly for the heliostat and the heliostat comprising the reflecting face supporting assembly, each adjusting piece is provided with at least two bonding pieces so that a plurality of supporting points on the back of the reflecting face can be integrated, the overturning rigidity of the reflecting face supporting assembly is improved, and accordingly the situation that when the reflecting face is in a non-horizontal state, the preset face shape of the reflecting face is damaged due to the low overturning rigidity of the reflecting face supporting assembly, and the quality of the reflecting light spots is affected is avoided.