The invention relates to a subsea pipeline scouring protection device using a flexible plate group and aims to provide a device which is simple in structure, low in cost, small in lodging and excellent in siltation promotion effect and is suitable for various water flow conditions. The technical solution adopted by the invention is as follows: a subsea pipeline scouring protection device using a flexible plate group comprises at least one seabed base plate which is horizontally paved beside a subsea pipeline; the subsea pipeline scouring protection device using the flexible plate group is characterized by further comprising a plurality of flexile plates arranged on the seabed base plate; an angle formed by the plane of the flexible plates and the axis of the subsea pipeline is smaller than plus-minus 15 degrees; and the seabed base plate is fixed at subsea by anchor piles.