The present application relates to the laundry treatment technology field, and provides a base, a laundry treatment device and a cleaning system. The base comprises a pedestal and a water inlet assembly. The pedestal comprises a washing portion and a robot vacuum cleaner chamber. The washing portion is configured to wash a cleaning member of a robot vacuum cleaner. The water inlet assembly comprises a primary water inlet path, and further comprises a first water inlet branch in fluid communication with the primary water inlet path and/or a second water inlet branch in fluid communication with the primary water inlet path. The primary water inlet path is configured to be fluidly connected to a tap water path. The first water inlet branch is in fluid communication with the washing portion. The second water inlet branch is configured to be fluidly connected to a liquid container of the robot vacuum cleaner. At least one of the washing portion and the liquid container is supplied with tap water by the primary water inlet path.