The invention provides a construction method for overall support removal and relates to the field of bridges. A cast-in-place box beam comprises a beam surface, a beam bottom and a pier body. A support formwork comprises sand boxes, a distributive beam, bailey beams and brackets. The construction method for overall support removal includes the steps that holes are formed, specifically, the through holes are formed in the beam surface; removal equipment is mounted, specifically, the removal equipment comprises hanging belts, collecting and releasing mechanisms and a control mechanism, the collecting and releasing mechanisms are mounted on the beam surface and close to the through holes, and the hanging belts penetrate through the through holes to hang a main cross beam; the support formwork is separated, specifically, the sand boxes and the brackets are removed, and the hanging belts hang the support formwork to suspend the support formwork; and the support formwork is dismounted, specifically, the collecting and releasing mechanisms continuously retract to release the hanging belts, and the support formwork is dismounted after slowly falling to an operation height. The removal equipment provided by the invention is simple, easy to transfer and small in occupied space, greatly reduces land, can be used at narrow construction sites or bridges on cliffs, and is wide in application area.