The invention relates to a wheel track changing suspension mechanism of traveling machinery. The wheel track changing suspension mechanism is especially suitable for changing distance between wheels on two sides on a front axle and a rear axle and distance between the front axle and the rear axle of a motor vehicle. The mechanism mainly comprises front and rear variable folio angle suspension mechanisms, front and rear wheel track adjusting mechanisms and a steering mechanism, front and rear suspensions respectively comprise left and right rotary arms in symmetric arrangement, one ends of the left and right rotary arms are hinged, the hinged end is fixed on an intermediate cross beam through a rotary arm sleeve, the other ends of the left and right rotary arms are fixedly provided with vertical shafts and vertical shaft sleeves in a sleeved manner, one ends of the vertical shafts are hinged with sliding sleeves which are respectively mounted at two ends of an optic shaft on front wheels and a spline shaft on rear wheels, the included angle between the left and right rotary arms is adjusted through the front and rear wheel track adjusting mechanisms which are structurally identical and symmetric, and the steering mechanism performs direction handle type control or direction disc type control. The wheel track changing suspension mechanism has the advantages of high trafficability, low requirements on road surface condition, stability in standing and the like.