The invention provides a pyrolysis and gasification method for industrial solid waste. The method comprises the following steps that (1) the waste is classified into waste containing chlorine but not containing transition metal and waste containing transition metal but not containing chlorine according to the fact whether the waste contains the chlorine element or the transition metal, and the waste containing chlorine but not containing transition metal and the waste containing transition metal but not containing chlorine are independently stored; and (2) the waste containing chlorine but not containing transition metal is thrown into an A pyrolysis and gasification furnace to be subjected to oxygen-poor pyrolysis and gasification, and the waste containing transition metal but not containing chlorine is thrown into a B pyrolysis and gasification furnace to be subjected to oxygen-poor pyrolysis and gasification. As the wastes containing chlorine but not containing transition metal and the waste containing transition metal but not containing chlorine is classified in advance, no metal ion serving as a reaction catalyst exists when the waste containing chlorine but not containing transition metal burns, and secondary composition of dioxin is effectively prevented; as no chlorine exists when the waste containing transition metal but not containing chlorine burns, dioxin is not generated during burning, and generation of dioxin is controlled from the source.