The utility model belongs to the technical field of general equipment, relates to a dumbbell-like and olive-like asymmetric bidirectional conical thread connection pair, and solves the problems of poor self-positioning and self-locking performance and the like of the conventional thread. The internal thread (6) is a bidirectional conical hole (41) (non-entity space) on the inner surface of the cylindrical matrix (2), the external thread (9) is a bidirectional cone frustum body (71) (material entity) on the outer surface of the cylindrical matrix (3), and the complete unit body thread is a bidirectional conical body with left taper (95) larger than right taper (96) and/or olivary taper (93) smaller than the right taper (96). The performance mainly depends on the conical surfaces and the conicity of the mutually-matched threaded bodies, and has the advantages that the internal thread and the external thread form a section-by-section conical pair through a conical hole containing cone and a bidirectional conical hole (41) and a bidirectional conical table body (71) to form a thread pair (10) until the internal cone and the external cone are in spiral conical surface sizing fit or sizing interference, so that the threaded connection function is realized.