The invention discloses an underwater robot propeller real-time monitoring current noise reduction method. The current current data is displayed in real time; the influence of random noise interference in the current original data is reduced effectively, and the current data obtained after noise reduction is allowed to be approximate to the real current data; and mean error, root-mean-square errorand average relative error between the current data obtained after noise reduction and the real current data are further reduced. The invention also provides an underwater robot propeller current real-time monitoring system suitable for the method above.