The invention belongs to the technical field of environmental protection and resource reuse, and particularly discloses a stepping type air suction and ash removal dust collector. The stepping type air suction and ash removal dust collector comprises a tank body, wherein an air discharging pipe and an air feeding pipe are arranged at the upper end of the tank body; a cloth bag is arranged in the tank body; a partition plate is arranged inside the tank body; the upper end of the partition plate and the inside of the tank body define an air discharging cavity communicated with the air discharging pipe; the lower end of the partition plate and the inner wall of the tank body define an air feeding cavity communicated with the air feeding pipe; the lower end of the air feeding cavity is a collection cavity; a dust collection box is arranged at the lower end of the collection cavity; multiple through holes are formed in the partition plate; the cloth bag is located at the lower end of the partition plate; an opening of the cloth bag is fixedly connected with the lower ends of the through holes; the inside of the cloth bag is communicated with the air discharging cavity; a fixed mesh is arranged between the air feeding cavity and the collection cavity; the lower end of the cloth bag is fixed on the fixed mesh. Compared with the prior art, the dust collector disclosed by the inventioncan quickly and conveniently clean dust during dust removal of the cloth bag, and the ash removal process can be completed in the tank body without a person, so that the environment cannot be polluted; the dust is greatly cleaned, and the device cannot be damaged.