A flame heat regulating apparatus for a cooktop of a gas stove, having an inner hollow shell and an outer wall which are both placed onto the stove cooktop. The shell further positioned to surround a gas burner is arcuate in shape, having a smaller sized bottom side and a larger sized top side. A plurality of air passages are through the shell, wherein the air passages are more densely distributed onto a lower part of the shell, as compared with the air passages which are less densely distributed onto an upper part of the shell. The outer wall further positioned to surround the shell has a plurality of air passages which are evenly distributed therethrough. In addition, a plurality of extensions projecting upwardly are spaced on a top side of the wall to support a cookware. The apparatus increases heating efficiency of the flame, and prevents undesirable heating of a handle of the cookware in cooking.