The invention relates to processing technology for manufacturing a board by utilizing crop straws, which is characterized in that the processing technology comprises the steps of: a, preparing materials, namely performing processing treatment on the crop straws to prepare needed raw materials, and evenly mixing the raw materials with an adhesive; b, paving the materials namely paving the mixed materials to form a board blank to be hot-pressed; c, carrying out hot pressing on the board, namely molding the board blank into the needed board with the hot-pressing board; dividing the hot-pressing process on the board blank into a compression stage, a molding stage and a tempering treatment stage, wherein a molding temperature set value in the molding stage is lower than a compression temperature set value in the compression stage, and a tempering temperature set value in the tempering treatment is between the molding temperature set value and the compression temperature set value; and d, post processing, namely carrying out post processing on the board after the hot pressing to obtain a finished product. Therefore, the processing technology has no technological design of the conventional steam release stage, can solve the problems of layering, board bursting and bubbling in the process of manufacturing the board, save the time, and improve the rate of finished products and processing efficiency..