Provided are a control device of a water purifier, a water purifier, and a control system of a water purifier. The control device of a water purifier includes a communication module transmitting operation information regarding an operation of the water purifier to a central server and receiving control information regarding control of the water purifier from the central server, and a control module generating the operation information and transmitting the generated operation information to the central server through the communication module and controlling an operation of the water purifier on the basis of the control information received from the central server.