The utility model discloses a limiter for concrete protection layer, which is a steel plate with 'n' shaped cross section. The through wall bolt holes are arranged on the middle of the cross plate on the top of the 'n' shaped steel plate. The two wings of the steel plate are bended upward. Two wing grooves which is used to arrange reinforced bar are formed on both sides. The limiter for concrete protection layer and the mould plate are cooperated and connected with the through wall screw bolts. The distance from the 'n' shaped cross plate to the two wing grooves is shorter than the height of the through wall nuts of the mould plate. The difference between the height of the limiter for concrete protection layer and the height of through wall nut of the mould plate is the thickness of the concrete protection layer. The utility model is simple in structure, practical, easy to manufacture, and convenient to assemble. The limiter for concrete protection layer is used and cooperated with the through wall screw bolt, to effectively control the thickness of the concrete protection layer. No trace is left on the surface of the finished concrete. The limiter for concrete protection layer is beneficial to the improvement of the quality of the building concrete construction. The utility model is adapt for all kinds of concrete project.