The invention relates to a solid waste high-pressure steam catalyst hydrolysis device. Wherein, it comprises boiling kettle, mixing axle, mixing blade, and blade plate; each group of mixing blades areformed by long and short ores and blade plate; the end of blade plate of long mixing blade has small space with the wall of container to mix and scrape the matter near the wall of pressure container,while the end of blade plate of short mixing blade has large space with it to mix the matter far away the container wall; the blade plates of them have reversed angles with mixing axle, and their movement tracks are reversed screw line; the mixing blade groups at two ends are symmetry with the vertical line of main axle via the blade plate angles, to bidirectional multilayer mix the matter, and discharge and charge matter into contain; and the rotation speed of mixing axle is controlled by frequency-variable device.