The invention relates to a complexed bamboo, a complexed bamboo artificial board and a preparation method thereof, and belongs to the technical field of bamboo processing. The preparation method of the complexed bamboo comprises the following steps: (1) a bamboo is prepared; (2) plant polyphenol is introduced in the bamboo to obtain a polyphenol bamboo; (3) metal salt is introduced in the polyphenol bamboo to obtain a polyphenol metal salt bamboo; and (4) the polyphenol metal salt bamboo is dried to obtain the complexed bamboo. The plant polyphenol-metal salt is introduced in the bamboo; through a complexing reaction between the plant polyphenol and the metal salt, the plant polyphenol and the metal salt are fixed in bamboo cells to prepare the bamboo as the complexed bamboo; and through combination or recombination processing, the complexed bamboo artificial board is prepared. The prepared complexed bamboo and complexed bamboo artificial board have such advantages as reduction of cracking or even no cracking, stable sizes, beautiful textures and rich colors.