The invention discloses a suction penetrating assembled anchoring foundation comprising no less than two flat plate anchors. Each flat plate anchor is formed by welding one or more rectangular steel plates and a connecting handle perpendicular to the plane of the steel plate. The two ends of the connecting handle are provided with mooring holes. During construction, the steel plates anchored on each flat plate anchor are staggered, stacked and closely attached to each other in the vertical direction, and then the anchoring foundation stacked into a whole is clamped in a notch of a barrel-shaped base, one end of an anchor chain is moored to the mooring hole in the connecting handle on the uppermost flat plate anchor, a steel rope is used to connect the mooring holes of the adjacent flat plate anchors to assemble the flat plate anchors into a series connection shape, the anchoring foundation penetrates into a seabed design depth by means of the barrel-shaped base, and the barrel-shaped base is removed; and when tension is applied to the anchor chain to reach a design value, the construction comes to an end. Each flat plate anchor moves freely under the action of tension, the postureof each flat plate anchor is different, the friction between the flat plate anchor and a seabed soil body can be increased, and thus the uplift bearing capacity of the anchoring foundation is improved.