The utility model discloses a volatile organic compounds waste gas catalytic oxidation reaction unit of low resistance for the purification contains the volatile organic compounds's of well high concentration waste gas, and it includes the reaction unit main part, reaction unit main part both ends are provided with gas access and the gas outlet that is linked together with reaction unit main partinner chamber respectively, the gas access is linked together with the exhaust piping, and the gas outlet is linked together with exhaust pipe, the level of going back is provided with the catalyst module in the inner chamber of reaction unit main part, be provided with airflow distribution plate between gas access and the catalyst module, it is used for carrying out gas distribution to the wastegas in the gas access gets into the reaction unit main part at least, and messenger's waste gas gets into the catalyst module and reacts through the inner channel of reaction unit main part again after walking around airflow distribution plate. The utility model has the advantages of reasonable design, avoid waste gas to pass thick catalyst layer, reduced reaction unit's overall pressure drop to realize that the high -efficient of volatile organic compounds purifies.