The invention discloses a preparation method of lightweight porous wheat straw concrete panels, and belongs to the field of cement concrete panel preparation. According to the preparation method, straw fiber is adopted to replace traditional chemical fiber, a mechanical physical stirring foaming agent is adopted for foaming, and foam and fiber are uniformly dispersed in concrete panels. The preparation method comprises following steps: a high speed mechanical stirring foaming agent and water are used for inducing foam for further using; a gel material, quartz sand, mixing water, and a specially prepared water reducer are stirred for uniform mixing, then the foam and wheat straw fiber are added for high speed mixing; after concrete preparation, the obtained mixture is introduced into a panel mould for slight vibration; after surface smoothing and leveling, the mould is introduced into a curing chamber for standard curing, and demoulding is carried out 24h later. The lightweight porous wheat straw concrete panels are light in weight, smooth and defect-free in surfaces, and are green environment-friendly decoration materials that can be used widely.