The invention relates to scrimber and a preparation method thereof. According to the scrimber, logs and brush wood with a small diameter are taken as woody raw materials, the woody raw materials are cut off, soaked and ground to form wood bunches which are not broken in the longitudinal direction or loose in the transverse direction and are connected in a staggered manner, the wood bunches are separated, dried, glued, assembled, paved and hot-pressed through turning, pressing and twisting, and the scrimber is prepared. The scrimber has the main performance as follows: the thickness ranges from 15 mm to 25 mm, the density ranges from 1.1 g/cm<3>-1.2 g/cm<3>, the internal bond strength ranges from 4 MPa to 5 MPa, the static bending intensity ranges from 120 MPa to 130 MPa, the thickness swelling rate of the scrimber after water absorption is 4%-5%, and the formaldehyde emission ranges from 1.2 mg/L to 1.4 mg/L. The scrimber and the preparation method have the advantages that the scrimber product prepared with the simple and efficiency process has better mechanical strength and size stability and is suitable for large-scale production, the economic benefits are high, the utilization efficiency and the economic value of wood are improved, and convenience is provided for production, utilization and popularization of the scrimber.