[Problem] To provide a chemical solution preparation system and a cleaning device which are capable of increasing safety. [Solution] A robot system (1) has a robot (100) that prepares a chemical solution and injects the chemical solution into a container and a cleaning device (700) that cleans, using cleaning liquid, a surface of the container (716) into which the chemical solution has been injected by the robot (100). The cleaning device (700) has a lid unit (702) an opening (703) of which is closed or opened by being attached to or detached from a cleaning chamber (701), and the lid unit (702) is provided with a hook member (708) for hanging the container (716).
