The invention provides an impeller type washing machine with a noise sensor. The impeller type washing machine comprises a box body as well as a transmission system and a computer board which are arranged in the box body; the impeller type washing machine further comprises the noise sensor, an acquisition and processing module and an adjusting module, wherein the noise sensor is fixed on the box body and placed on one side of the transmission system; the acquisition and processing module and the adjusting module are integrated on the computer board; the invention further provides a noise monitoring method of the impeller type washing machine with the noise sensor. According to the invention, as the noise sensor is additionally mounted and combined with the acquisition and processing module and the adjusting module integrated on the computer, the vibration noise of the impeller type washing machine can be monitored timely and the sound qualitative data serves as references; when the monitored value reaches the preset limit, the washing machine is subjected to speed reduction or eccentric adjustment, the whole procedures of the washing machine can be completed steadily and quietly. The impeller type washing machine has the advantages that the properties in noise, vibration, safety and service life are improved and the users' satisfaction is improved at the greatest extent.