Disclosed are a floor brush of a dust collector and a dust collector having same, the floor brush of a dust collector comprising: a main body, the main body defining an air channel therein and being provided with, on a lower surface at the front end thereof, a suction port in communication with the air channel, when the main body covers a surface to be cleaned, an air-tight space being formed between the air channel and the surface to be cleaned, and the front end of the main body being provided with a front air inlet port in communication with the air channel; and a flow guiding portion, the flow guiding portion being provided at the front end of the main body and being provided adjacent to the front air inlet port, and the flow guiding portion being provided with a flow guiding face so that the external air passes through the flow guiding face and the front air inlet port into the air channel.