Upright vacuum cleaner floor brush assembly and upright vacuum cleaner comprising same

An upright vacuum cleaner (1) floor brush assembly and an upright vacuum cleaner (1) comprising same, the floor brush assembly comprising: a roller brush (11); a motor (22), the motor (22) driving the rotation of the roller brush (11) by means of a transmission belt (13), the transmission belt (13) being wound around a motor shaft (221) of the motor (22) and a centre part of the roller brush (11); a roller brush shell (12), the roller brush shell (12) covering the roller brush (11), and the roller brush shell (12) being provided with a dust suction opening, a roller brush suction flow channel (122) in communication with the dust suction opening and a transmission belt installation cavity (123) used for installing the transmission belt (13) being defined inside the roller brush shell (12), the roller brush suction flow channel (122) comprising a first suction flow channel (1221) and a second suction flow channel (1222) positioned on two sides of the transmission belt installation cavity (123).