Construction method for concrete hollow floor formed by self-supporting box

The invention discloses a construction method for a concrete hollow floor formed by using a self-supporting box, and belongs to the technical field of hollow floor construction. Comprising the following steps that S1, a formwork is installed, and frame beams and rib beams are positioned; s2, mounting frame beams and rib beam steel bars; s3, plate bottom steel bars are bound, and water and electricity pipelines are pre-buried; s4, assembling and laying a self-supporting box; s5, carrying out anti-floating measure treatment on the self-supporting box; s6, binding plate surface steel bars; s7, concrete pouring; s8, controlling the flatness of the concrete surface; s9, concrete curing and form removal are conducted; wherein in the step S7, before the concrete completely covers the self-supporting box, a negative pressure pipe is tightly installed at the upper end of a through hole of the self-supporting box, the bottom face of the self-supporting box is sucked, and the concrete around the bottom face of the self-