The invention relates to a forced guiding multistage rotation pressing flame ash separating structure for a cooking furnace. The forced guiding multistage rotation pressing flame ash separating structure comprises a flame collecting box which is in a cavity ring shape. A cavity second-stage flow guiding ring used for guiding the moving direction of flames communicates with the upper portion of the flame collecting box. A first-stage flow guiding plate used for scattering the flames is arranged between the second-stage flow guiding ring and the flame collecting box. The position of an inner opening of the flame collecting box is shielded through the first-stage flow guiding plate. Due to the graded flow guiding of the first-grade flow guiding plate and the second-stage flow guiding plate, light ash contained in the flames can be thoroughly knocked off, and the structure can be applied and popularized in any industry needing cooking, usable scenes the same as traditional energy such as electric heat, gas, fuel, fire coal and the like are available, and the structure has the larger excellence in the aspects of safety, flexibility and energy loss ratios. An opened type natural convection semi-gasification combustion manner is adopted, heat energy is directly transmitted to a container for heating to the maximum, forced flow guiding through an induced draught fan is avoided, heat energy cannot be lost, and the heat exchange efficiency is greatly improved.