A lamina body inner-back arc forming milling cutter comprises a cutter body or a plurality of cutter bodies 1, a common cutter blade 3, a molding cutter blade 4, and a cutter blade fixing groupware 5, wherein the cutter body 1 is equipped with a group of or a plurality of groups of cutter blades which are helically arranged on the cutter body, the cutter blades are mounted vertically or horizontally on the cutter body, the cutter bodies 1 are assembles into a combination body of columns and tapers finally, the columns and tapers are equipped with common cutter blades at each of their facades, and the transition position between the column facades and taper facades are formed by connecting a or a plurality of molding cutter blades 4. The present utility model has advantages as follows: the milling process is steady and springy, the processing precision is high, the lifetime of the cutting tool is long, a common cutter blade and a moulding cutter blade are capable of exchanging, the utilization rate of cutter blades is increased, then the cost is depressed.