An iron-framed modular seat, comprising a modular seat cushion, W-shaped steel bars are welded to a circumference of the seat frame, a seat cushion cover is provided on an outer side of the seat frame; a plurality of first connecting interfaces are correspondingly provided on the seat frame and the back frame; a plurality of second connecting interfaces are correspondingly provided on the seat frame and the armrest frames; a bottom of the seat frame is detachably provided with a plurality of independent support legs, and a plurality of third connecting interfaces are correspondingly provided on the independent support legs and the seat frame. The W-shaped steel bars not only strengthen the structural strength of the seat frame, but also form a detachable connection with the seat cushion cover.