Ground brush of dust collector

A ground brush of a dust collector comprises a shell formed by an upper cover and a bottom plate, the bottom plate is provided with an exhaust inlet with a downward opening, an air suction channel communicated with the exhaust inlet is formed between the upper cover and the bottom plate, a movable top plate capable of moving upwards is arranged at the front part of the upper cover, when the movable top plate moves upwards, the front part of the air suction channel can be exposed outside, and air suction air flow can be formed at the front part of the ground brush. In the utility model, when corners and the like are cleaned, the movable top plate can be jacked, so that the front part of the air suction channel can be exposed, the forward air suction air flow can be formed; when narrow gaps are cleaned, the ground brush of the dust collector can be lifted up, so that one side of the movable top plate is contacted with the ground, and when contacting with the ground, the movable top plate is lifted up and can cl