Abstract: Disclosed herein is a shoelace tying device which is coupled to a shoelace so as to firmly maintain a tightly tied state of the shoelace on a shoe. The shoelace tying device comprises a housing, a pair of lace passages, into which both free ends of the shoelace are threaded to penetrate therethrough, respectively, and a pair of shuttles, which are vertically reciprocatable so as to widen or narrow a width of the lace passages, respectively. When the shoelace, penetrating through the lace passages, is pulled to tighten a shoe, the shuttles are moved to widen the width of the lace passages, respectively, thereby securing free movement of the shoelace. On the contrary, when the shoelace is untied to loosen the shoe, the shuttles are moved to narrow the width of the lace passages, respectively, thereby restricting the movement of the shoelace.