Roller brush, floor brush head, brush bristle structure, and vacuum cleaner

A roller brush, comprising a roller brush substrate (12), at least one cleaning member mounting portion (1) being arranged on the roller brush substrate (12),

• each cleaning member mounting portion (1) comprising at least one group of first cleaning slots (11) arranged in group, and the first cleaning slots (11) being configured to arrange cleaning members,
• wherein the number of the first cleaning slots (11) in each group arranged in group is at least three, the first cleaning slots (11) in each group are close to one another, a space d between slot walls close to each other of any two adjacent first cleaning slots (11) in each group does not exceed 18 mm,
• in the case that the number of groups of first cleaning slots (11) is one, an angle difference β between central axes of any two adjacent first cleaning slots (11) in each group of first cleaning slots (11) arranged in group on a circumferential surface located on the same cylinder using a central axis of the roller brush substrate (12) as a circle center is less than 360/n, wherein n is the number of the first cleaning slots (11) in each group arranged in group, and
• in the case that the number of groups of first cleaning slots (11) is greater than or equal to two, an angle difference α between two first cleaning slots (11) close to each other of any two adjacent groups of first cleaning slots (11) is greater than the angle difference β between the two first cleaning slots (11) close to each other in each group.