The invention discloses a waste crop bast raw material resource utilization method. The waste crop bast raw material resource utilization method includes the steps that S1, an ionic type extraction agent is used for extracting the waste crop bast raw materials, and a pectin solution and bast fibrous residue can be obtained after separating solid and liquid; S2, ethyl alcohol is added after the pectin solution is condensed, static settlement is carried out after stirring, washing and drying are carried out, and finished pectin can be obtained; S3, acidizing is acted to the bast fibrous residue,and glass fiber is added to mix evenly, a binding agent and a curing agent are added, and fiberboards are obtained by compressing. According to the waste crop bast raw material resource utilization method, the bast fibrous residue is used for preparing the fiberboards after the pectin is extracted, the waste crop bast raw materials can be recycled to the maximum, the obtained pectin is green foodwithout pesticide pollution, transgenic ingredients are not contained, and the heat stability is high; and the performance of the fiberboards produced by the bast fibrous residue replacing portion ofthe glass fiber, the economic benefit of integrated utilization is better, and the practical significance is important.