▎ 摘　　要

NOVELTY - Preparation of composite foam material comprises dispersing first carbon-based filler in solvent to obtain first carbon-based filler dispersion, diluting foam matrix material with first carbon-based filler dispersion, obtaining a mixed solution having a solid content of less than or equal to 6.25 %, freeze-drying mixed solution to obtain open-cell foam matrix material, and adsorbing second carbon-based filler to open-cell foam matrix material. USE - The method is for preparing composite foam material used for flexible material and pressure sensor (claimed). ADVANTAGE - The material has effective construction of carbon material filler net structure by adjusting space distribution of carbon filler and avoiding stack of carbon filler. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) a composite foam material comprising first carbon-based filler, and open-cell foam matrix material provided with a cell with opening structure, where inner wall of foam hole is attached with second carbon-based filler; and (2) reduction method of composite foam material comprising performing in-situ reduction to composite foam material to obtain reduced composite foam material.