Abstract: A method of preparing high-strength, high-toughness, and recyclable fiberboard with bionic structure and its recycling treatment method. The present invention relates to a method for preparing a fiberboard and a recycling method thereof, which solves the problem that the current technologies fail to prepare a green, environmentally friendly, high-strength, high-toughness and recyclable fiberboard with bionic structure. The method includes (1) pretreatment; (2) swelling treatment, (3) dissociation and dispersion treatment; (4) centrifugation; (5) hydrogel construction; and (6) densification treatment. The recycling treatment is: the high-strength, high-toughness, and recyclable fiberboard with bionic structure is placed in a crusher for crushing treatment, and then swelling treatment, dissociation and dispersion treatment, centrifugation, hydrogel construction, and densification treatment are repeated.