The invention discloses a preparation method of a bamboo tie artificial board, which comprises the following steps: (1) material preparation: evenly subdividing circle bamboos into bamboo splints, suppressing the bamboo splints by a roller, wherein the rolling pressure is 20-50MPa; and removing bamboo greens and tabasheers of the bamboo splints; (2) drying the bamboo splints to cause moisture content to be 8-12%, carrying out sizing treatment, wherein sizing amount is 10-18% and glue is urea-formaldehyde glue (UF) or phenolic formaldehyde glue (PF); (3) assembly mode: carrying out gluing assembly in accordance with design requirements of the bamboo tie artificial board; (4) hot-forming: carrying out hot-pressing on the assembled bamboo tie artificial board slabs by a hot-press, wherein the hot-pressing temperature is 140-160 DEG C, time is 0.4-0.6min/mm, and pressure is 2.0-3.0 N/mm<2>; and (5) edge trimming process: carrying out edge trimming process on the hot-formed bamboo tie artificial board by a trimming machine in accordance with design requirements, inspecting and putting in storage. The invention is a bamboo tie artificial board with high strength, high rigidity, and gooddimensional stability.