Dust collector

The invention relates to a dust collector. Comprising a main machine device and a cyclone separation device, the cyclone separation device comprises a shell and a cyclone separation assembly, a first dust chamber is formed between the cyclone separation assembly and the inner side wall of the shell, the cyclone separation assembly comprises a first cyclone unit and a second cyclone unit, and a second dust chamber is arranged in the second cyclone unit; the second cyclone unit comprises a base and an annular air grid connected with the base, the annular air grid comprises a top plate, a plurality of blades and airflow guiding pieces arranged on the peripheries of the blades, the top plate is connected with the first cyclone unit, the blades are annularly connected to the top plate, a filtering opening is formed between every two adjacent blades, and the second dust chamber is arranged in the base. The first dust chamber is communicated with the second dust chamber through a filtering opening of the annular air