Resource-saving modular honeycomb building

The invention relates to the technical field of building structures, in particular to a resource-saving modular honeycomb building which comprises a steel frame, honeycomb units and a supporting frame; the steel frame is fixedly connected with the outer vertical face of an existing building; the supporting frame is fixedly connected with the steel frame; each honeycomb unit comprises side face plates, front face plates and rear face plates; each side face plate comprises a top plate, a bottom plate, a left upper side plate, a right upper side plate, a left lower side plate and a right lower side plate which are rotationally connected in sequence, so that a regular hexagon tubular body is defined by the side face plates; the front face plates and the rear face plates are both regular hexagons matched with the end face of the regular hexagon tubular body; the front face plates and the rear face plates are both detachably connected with the regular hexagon tubular body; and six groups of supporting rods are matc