Abstract: An insert-connecting toy which is insert-connected by several irregular construction units, in which, said construction units are dividing into meta-elements and sub-elements; the thickness of the thinnest sub-element is taken as an unit thickness; and the thicknesses of the other sub-elements are integer number times the unit thickness; several grooves are arranged on the meta-element, and the width of said groove and the width of the laminate convex bank formed by said grooves are all integer number times the unit thickness; and several grooves are also arranged on at least one of the sub-elements, and the width of the groove and the width of the laminate convex bank formed by said grooves are also integer number times the unit thickness; and therefore a multiple insert-connecting model can be constructed. So said construction units can be insert-connected into stereo animal models which are lifelike in shape, vivid in mold-making and very attractive to children.