The invention discloses a button-hole machine baseline threading mechanism. The button-hole machine baseline threading mechanism comprises a machine stand, a counter wheel, a feeding assembly, a thread core feeding assembly and a winding assembly, wherein a supporting rod is arranged on the machine stand; the counter wheel is arranged on the supporting rod and positioned above the machine stand; a feeding box is arranged on the feeding assembly and comprises a annular feeding channel enabling hollow thread cores to be fed; the width of the feeding channel is larger than the thicknesses of the hollow thread cores; the feeding box comprises a discharging channel; the thread core feeding assembly comprises a thread core feeding rod and a thread core feeding drive part; the thread core feeding drive part is used for driving the thread core feeding rod to move; the winding assembly comprises a spool, a winding drive part and a clamping part; the winding drive part is arranged on the machine stand and is connected to the spool so as to be used for driving the spool to rotate; and the clamping part is arranged on the machine stand and can move towards the spool so as to clamp the hollow thread cores on a thread feeding shifting lever. The button-hole machine baseline threading mechanism is capable of saving time and labor.