Provided is a cleaning robot system and a method of controlling the same for economically cleaning, with high workability, plate-shaped members, such as solar cell panels and reflecting mirrors used in photovoltaic power generation and solar thermal power generation systems. A cleaning robot system (1) for cleaning planar or curved plate-shaped members (4a), (4b) that are panels for photovoltaic power generation or reflecting mirrors for solar thermal power generation includes: a large number of cleaning robots (2) each having a function to travel on each of the plate-shaped members (4) which are to be cleaned and a function to clean the plate-shaped members (4); and an arranging robot (3) having a conveying function to move any of the cleaning robots (2) from a first one (4a) of the plate-shaped members to a second one (4b) of the plate-shaped members. Each of the cleaning robots (2) has a suction mechanism for performing cleaning while attaching onto one of the plate-shaped members (4), and the large number of cleaning robots (2) and a smaller number of the arranging robots (3) than that of the cleaning robots (2) cooperate together to clean the plate-shaped members (4) placed in a photovoltaic power generation or solar thermal power generation plant.