Composite bamboo board and preparation method thereof

The invention discloses a composite bamboo board and a preparation method thereof, and relates to the technical field of material preparation. According to the preparation method disclosed by the invention, the product is prepared by taking bamboo as a raw material and adopting a graded sizing process, so that the waterproof effect of the prepared product is remarkably improved through a microcosmic improvement means on the premise that an aldehyde adhesive is not used, and the problems of mechanical property reduction, size enlargement, particle falling, stinking and the like caused by water absorption or soaking are avoided.