Composite floor with self-weight reducing function and favorable structural stiffness

The invention discloses a composite floor with a self-weight reducing function and favorable structural stiffness. The composite floor comprises a plurality of upright columns, column caps, hidden beams and a plurality of square dense rib plates, wherein the plurality of upright columns are vertically arranged and are uniformly distributed in a dot matrix way; the hidden beams are a plurality of beams which are horizontally and longitudinally crossed; one of the hidden beams is arranged between every two adjacent upright columns; a square rigid frame is confined by every four upright columns and every four hidden beams; two sides of the hidden beams in each square rigid frame are provided with upper hollow plate strips which are parallel to the hidden beams and are continuously distributed; two ends of the upper hollow plate strips extend to the corresponding column caps; central slabs larger than the dense rib plates in size are arranged in the centers of the rigid frames; and the dense rib plates are locate