The invention discloses a method for dynamically monitoring axis locus. The method comprises steps that 1, on a bearing seat of rotary equipment, vibration sensors are mounted at an X position and a Y position which are mutually orthogonal, vibration signals of the X position and the Y position are detected through an axis vibration signal acquisition system, and a detection result is transmitted to a background monitoring system; 2, an axis position is calculated by the background monitoring system according to vibration signal values of the X position and the Y position, and the axis position is dynamically displayed on a frame of the background monitoring system point by point; 3, the characteristic quantity of the axis locus is calculated, and a calculation result is displayed in the frame of the background monitoring system; and 4, whether the characteristic quantity of the axis locus surpasses the limit is determined, if the characteristic quantity surpasses an upper limit value, a limit surpassing alarm is displayed in the frame of the background monitoring system. According to the method, the axis locus of the rotary equipment is dynamically displayed point by point according to the acquired vibration signals of the rotary equipment, and the display effect is more intelligible and visual.