The invention discloses a micro arc surface reflector punching backplane, which belongs to the field of solar concentrator reflector back support. The micro arc surface reflector punching backplane comprises an annular shaping part, two arc forming parts, upper and lower two symmetrical arc connection arms, and reinforced supporting arms, wherein the annular shaping part is around one circle of the reflector edge; the two arc forming parts are distributed at the left side and the right side inside the annular shaping part, are symmetrical bilaterally and protrude inwardly in an arc mode; the upper and lower two symmetrical arc connection arms are connected with the central area of the two arc forming parts; the reinforced supporting arms are connected with at least four points distributed uniformly on the circumference of the annular shaping part, and after the reinforced supporting arms are intersected or crossed with the arc forming parts, a diamond or a regular polygon is formed; and the annular shaping part forms a planar structure in a surrounding mode, and the arc forming parts, the connection arms and the reinforced supporting arms form micro arc surfaces sunk towards to the central area relative to the plane. The surface figure precision of a heliostat reflecting surface and the reflecting spot quality are improved, the reflector supporting structure making efficiency and the part size consistency are improved, and the making cost of the heliostat structure is reduced.