The invention discloses an impeller washing device for a fiber filter media filter. The impeller washing device for the fiber filter media filter is arranged at the bottom part of a tank of the fiber filter media filter; an impeller is fixedly arranged at the upper end of a shaft; the shaft is positioned in a bearing block through an upper bearing and a lower bearing; the lower end of the shaft is connected with a large belt wheel; the large belt wheel is connected with a small belt wheel on an output shaft of a motor by utilizing a belt; the motor is fixedly arranged on a base; the bearing block is fixedly arranged on a flange at the lower end of the tank by utilizing a connecting flange; and the impeller is located in the center of the interior of the tank. According to the impeller washing device for the fiber filter media filter, sludge adsorbed on the filter media is washed by using the impeller washing device, and thereby, washing is simple and convenient; a washing effect is good; corollary equipment is less; the washing device and the filter are better in overall consistency; the economic cost is lower; a backwashing effect is good; and the working efficiency is high.