Relating to the technical field of lime kiln channel cleaning, the invention discloses a method for prolonging the cleaning period of a Maerz lime kiln channel. Specifically, the temperature of an annular channel in a Maerz lime kiln, the unloading frequency of a heat storage chamber in the Maerz lime kiln during each production cycle, and the excess air coefficient of combustion air are controlled within a certain range. By controlling the temperature of the annular channel, the unloading frequency and the excess air coefficient within the range, the cleaning cycle of the annular channel in the Maerz lime kiln can be prolonged to 60-80 days at a time from 10-15 days at a time at present, thus prolonging the cleaning cycle of the annular channel in the lime kiln; because of the prolongingof the cleaning cycle, within a same period of time, the number of cleaning times is reduced, and meanwhile the labor amount of personnel is greatly reduced, and the kiln stop time is shortened, i.e.increasing the working time of the lime kiln, so that greater economic benefits can be created.