The invention discloses a preparation method for a novel phenolic aldehyde-based SMC material, and belongs to the technical field of phenolic aldehyde SMC new materials. The preparation method comprises the following steps: (1) resin modification; (2) mixing and stirring of powder materials; (3) preparation of a resin paste slurry; (4) preparation of PF-SMC; (5) curing; and (6) mold pressing. Thepreparation method provided by the invention has the following beneficial effects: due to no need of exhausting during mold pressing, the technical problems of need of exhausting, poor material surface quality, low product strength, difficult mold pressing of large-sized components and the like for the phenolic aldehyde based SMC material in the prior art are solved; meanwhile, the problem of environmental pollution caused by exhausting is solved; the defects of a process for a phenolic aldehyde molding material are thoroughly overcome; the quality of a product is significantly improved; and the ecological environment is protected.