The invention provides a combustion method and combustion device for solid fuel. According to the combustion method, a material stacking layer is formed in a hearth, an air inlet side is formed in the part, above a furnace grate, of the hearth and on one side of the material stacking layer, and a combustion side is formed in the side opposite to the air inlet side; the air inlet side and the combustion side are separated by the material stacking layer, and a heat accumulator is arranged on the flowing path of volatile matter air flow of the combustion side; in the combustion process, the fuel combusts to generate combustion flames and heat the heat accumulator, then volatile matter of the fuel is separated out by heating the fuel, wind penetrates through a fuel layer transversely and carries the separated-out volatile matter and the combustion flames to penetrate out of the combustion side and flow towards a combustion cavity, and the volatile matter is ignited when flowing through the heat accumulator and the combustion flames and then enters the combustion cavity to be combusted. According to the invention, sufficient combustion of the volatile matter can be guaranteed, natural matching between automatic and ordered feeding and the combustion speed can be achieved, the ash melting problem can be solved, and stable and continuous combustion can be guaranteed.