The invention discloses a washing system and a control method thereof. The washing system comprises a man-machine interaction module, an arbitration scheduling module and a plurality of washing machines, wherein the man-machine interaction module is used for receiving operation instructions from a user, and transmitting the operation instructions to the arbitration scheduling module; the arbitration scheduling module is respectively connected with the man-machine interaction module and the washing machines and used for receiving the operation instructions transmitted from the man-machine interaction module, obtaining state information of the plurality of washing machines, generating running state adjusting instructions according to the operation instructions and the state information, and sending the running state adjusting instructions to the plurality of washing machines; the plurality of washing machines are used for receiving and executing the running state adjusting instructions. In the washing system and the control method thereof, disclosed by the embodiment of the invention, the man-machine interaction module and the arbitration scheduling module are arranged on the system to perform unified arbitration scheduling on the plurality of washing machines, so as to plan resources reasonably, save washing time, improve washing efficiency and improve the usage experience of the user.