The invention provides a heater tail gas treatment method and a heater tail gas treatment system adopting the same and relates to the technical field of car manufacturing. The heater tail gas treatment method comprises the steps that a heater is included; waste gas exhausted after burning in the heater is introduced to the front end of a tail gas treatment device of an engine exhaust system; and the waste gas exhausted from the heater is treated by the tail gas treatment device of an engine and then exhausted. By means of the tail gas treatment capability of the engine exhaust system, tail gastreatment of the parking heater is achieved, the tail gas pollution problem of the parking heater is solved with the few cost; and the heater tail gas treatment method and the heater tail gas treatment system can be widely applied to a vehicle-type parking heating system with methanol as fuel in a refitted mode and easy to apply and popularize.