The invention belongs to the field of combustion equipment and provides a series preheating method for combustion air and coal gas for a sintering ignition furnace. The series preheating method comprises the following steps: connecting a combustion air heat exchanger with a coal gas heat exchanger in series and combusting coal gas as a fuel in a hearth of a preheating furnace to generate flue gas; firstly, preheating the combustion air for the ignition furnace by using high-temperature flue gas, then preheating the coal gas for the ignition furnace by using low-temperature flue gas to ensure that the combustion air for the ignition furnace is preheated to 200-350 DEG C, and the coal gas for the ignition furnace is preheated to 150-300 DEG C, and then feeding into the sintering ignition furnace, performing heat convection on the combustion air for the ignition furnace and the high-temperature flue gas; performing heat convection on the coal gas for the ignition furnace and the low-temperature flue gas. The series preheating method disclosed by the invention can be applicable to the sintering ignition furnace which takes low-heating-value coal gas as a fuel, an ignition effect is improved, and the sintering ore quality is ensured. As the low-heating-value coal gas is used as the fuel, the energy consumption is reduced. Double-stroke tubular heat exchangers are used for heat exchange, so that the heat exchangers and the heat exchange areas are reasonably configured, the heat exchange effect is good, the heat exchange coefficient can be up to 20kcal/m2.h.DEG C, and the service life of the heat exchanger is prolonged.