Vacuum cleaner and suction nozzle thereof

A vacuum cleaner, comprising:

• a housing, a dust collecting unit, a filter assembly, a motor assembly and a roller brush assembly;
• wherein the dust collecting unit, the filter assembly and the motor assembly are located in the housing, and the motor assembly is communicated with the dust collecting unit via the filter assembly,
• the housing has a concave cavity communicating with outside, and the roller brush assembly is disposed in the concave cavity which communicates with the dust collecting unit via a duct;
• the roller brush assembly comprises a roller brush including a brush part and a brush body, and the brush part is disposed on the brush body;
• end portions of the brush body connect with the housing via bearings, a transmission component is arranged in the brush body which connects to a driving mechanism;
• and
• a separation piece is provided on a housing defining the concave cavity and the location of the separation piece corresponds to the transmission component, a fixed end of the separation piece is fixed on the housing and a free end thereof extends towards the longitudinal direction of the brush part, the free end of the separation piece at least reaches to a free end on the longitudinal direction of the brush part, such that a seamless and closed separation face is formed by a circular face formed while the roller brush is in high speed rotation in conjunction with the separation piece to block foreign object out of the transmission component.