The invention relates to a control method of a washing machine with a water quality sensor and the washing machine in the field of washing machines. The water quality sensor is washed at least once by virtue of a self-cleaning device before washing during a process of filling clear water into the washing machine and before water discharge during the final rinsing process; after the water quality sensor is cleaned, motored data are set as a clear water calibration value before washing during the process of filling the clear water into the washing machine. The washing machine is provided with the water quality sensor; the water quality sensor comprises a water quality sensor body; the water quality sensor body is provided with an inductive probe used for detecting the water quality; the water quality sensor is provided with a vibrating reed capable of generating supersonic ultrasonic waves to perform cleaning and vibrating on the water quality sensor. By virtue of the method, the washing machine is capable of disposing dirt adhered to the water quality sensor in time, discharging the dirt along with water during a water discharge process, ensuring the cleanness and sensitivity of the water quality sensor and ensuring accurate initial conditions of a washing process.