The invention belongs to the technical field of artificial board production and particularly discloses a processing method of a particle board. The processing method comprises raw material preparation, screening, flaking, drying, storing, mixing, mould feeing, hot pressing and inspecting and storing, wherein in the step of hot pressing, a motor is started, a second rotation shaft rotates to generate down pressing force, a down-pressing block drives a hydraulic block to move downward together so as to push an up-pressing plate to move downward and down press a particle board and heating plates; meanwhile, the particle board is extruded between the heating plates to realize a pressing operation of the particle board; and after the pressing of the particle board, the motor is turned off, a flexible connector and a spring recover deformation to promote separation of the heating plates, and then the upper surface of the particle board is separated from the lower surface of the heating plate. The scheme provides a processing method of a particle board, wherein the pressing plate is under uniform stress, and the pressed particle board easily falls off and is not crushed.