The invention relates to a wetting device (1) for flat mops, wherein a mechanical elevator (5) contains a contact structure (6) and brackets (7a, 7b), wherein the brackets (7a, 7b) lift the transfer plate (4) away from the lower end (35), if the contact structure (6) is pressed towards the lower end (35). The invention also relates to a cleaning trolley (40) with said wetting device (1).
