The invention provides an exhaust gas circulation device capable of performing methanol decomposition through engine waste heat. The exhaust gas circulation device comprises a gas inlet system, and the gas inlet system comprises a gas inlet pipeline, an engine assembly and an EGR-methanol decomposition integrator; the gas inlet pipeline is used for providing a flowing channel for an engine inlet gas; the engine assembly is used for burning the gas entering from the gas inlet pipeline to provide power for a vehicle; the engine assembly comprises a first gas inlet and a first gas outlet; the first gas inlet communicates with the gas inlet pipeline; the EGR-methanol decomposition integrator is arranged on the first gas outlet side of the engine assembly, and is used for introducing a part ofexhaust gas discharged from an engine into the gas inlet system again to be reutilized; and during the exhaust gas circulation process, the EGR-methanol decomposition integrator decomposes methanol into carbon monoxide and hydrogen through waste heat of exhaust gas of the engine, so that low-temperature cold start operation of the engine is achieved. According to the exhaust gas circulation device, waste heat of exhaust gas of the engine is utilized, heat is transmitted to methanol for methanol decomposition during the EGR circulation process, and waste heat of exhaust gas of the engine is fully utilized.