A conic curve drawing instrument, comprising a flexible cord (1), a flexible cord bead string (2), a flexible cord pen (3), a bead string slide fastener clamp (4), a bead string slide fastener pen (5), a fixing needle (6), a framework (7), a fixing strip (8) and a sliding T-shaped frame (9); the flexible cord bead string (2) consisting of the flexible cord (1) and beads (21) threaded on the flexible cord (1); the flexible cord pen (3) consisting of a pen nib (31) and a pen holder (32); the bead string slide fastener pen (5) consisting of a drawing pen (51) and a box body (52) mounted on the drawing pen (51), the box body being used to fix the bead string slide fastener clamp (4); the fixing needle (6) consisting of a fixing needle pen nib (61) and a fixing needle pen holder (62); the framework consisting of a framework a (71), a framework b (72), a bolt (73) and a fixing element (74); and a fixing needle insertion hole (91) and a slide groove (92) being provided on the sliding T-shaped frame (9), the slide groove (92) allowing the bead string slide fastener pen (5) to slide freely. The present drawing instrument has relatively high use value and economic value.
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