The invention provides a traffic safety facility for a roundabout of a rural-urban continuum and a design method of the traffic safety facility, aiming to improve the speed perception and the direction perception of a driver when the driver drives at the roundabout of the rural-urban continuum and improve the visual cognition capability of the driver to pedestrians crossing the street and barriers in a roundabout range. The facility comprises strip vertical face marker lines at the lower edge and the top of a roundabout annular-island curbstone; concrete separation piles are arranged between the outer side edge line of the roundabout annular-island curbstone and the outer side edge line of a road; concrete separation piles are arranged between the road side edge line of each road of the roundabout and a slope edge line; steel fixed separation piles and LED (Light Emitting Diode) lamp poles are arranged on pedestrian crosswalks and the lane edges at the sides of the roundabout, corresponding to the pedestrian crosswalks. The method adopts a low-cost road marker line and visual induction system and does not relate to a large-scale road infrastructure, so that the investment is small, the construction is easy and the effect is rapid to realize; the driving safety of the roads of the rural-urban continuum can be improved.