Synthesizing assembly for enhancing flatness of composite sheet

The invention discloses a synthesizing assembly for enhancing the flatness of a composite sheet. The synthesizing assembly comprises a composite sheet assembling structure arranged in a salt pipe, wherein the salt pipe is arranged in a carbon pipe, the carbon pipe is vertically arranged in an extrusion cavity of a pyrophyllite block, two end openings of the extrusion cavity of the pyrophyllite block are respectively provided with plugs, and the plugs sequentially press on the composite sheet assembling structure through a titanium sheet and a carbon block; the composite sheet assembling structure comprises three hard alloy reference blocks which are arranged according to upper, middle and lower positions; a composite sheet synthesis body is arranged between two adjacent hard alloy reference blocks, and a carbon sheet is cushioned between the composite sheet synthesis body and the adjacent hard alloy reference blocks; the cup body of the composite sheet synthesis body is internally provided with superhard texture powder and a hard alloy synthesis block which are uniformly laid, and a cup cover and a cup body cover are merged to extrude the superhard texture powder to the bottom of the cup body through the hard alloy synthesis block. The synthesizing assembly for enhancing the flatness of the composite sheet, which is disclosed by the invention, has good rigidity. A synthesized composite sheet can reach the flatness that a composite layer is less than 0.1 mm in a six-surface diamond presser system.