According to an embodiment of the present invention, a play teaching tool of a geometric assembly comprises: an edge part integrally formed to envelop an inner space having a predetermined shape; an ear shaped reinforcing combination part formed on one edge of the edge part; and a first piece member or a second piece member including elastic combination parts arranged on the edge part with predetermined regular gaps from a reinforcing combination part, having a width of the predetermined gaps wherein the first piece member or the second piece member forms a two-dimensional or a three-dimensional structure by combining the elastic combination parts with a combination concave part with a predetermined width between the reinforcing combination part and the elastic combination part, and the predetermined width of the elastic combination parts can contract and expand.
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