The utility model relates to a threading arc guide plate with output S roll for steel rolling field leveling cold rolling annealing rear steel volume, comprising an upper arc guide plate, a lower arc guide plate and an S roll. The structure thereof is that the lower arc guide plate is fixed on a frame through a pin, and a regulating block is fixed on the outside frame of the lower arc guide plate through a regulating bolt. The regulating block and the regulating bolt have two groups which are installed upside and downside respectively. The upper arc guide plate is composed of a following upper arc guide plate, a movable upper arc guide plate and a fixed upper arc guide plate. The following arc guide plate is fixed on an upper press roll which is driven by an upper press roll swinging cylinder, the movable upper arc guide plate is driven by a swinging hydraulic cylinder, the fixed upper arc guide plate which can be regulated by winding the pin and is fixed by the bolt is fixed on the frame. The upper and the lower arc guide plates can regulate gap with the S roll. The utility model has the characters pf novel structure, convenient regulation and large application, etc., which belongs to a new threading arc guide plate device with integration of economy and practicality.