A washing machine having a reminding function for preventing clothing from fading comprising an outer drum for washing water, wherein the washing machine is further provided with: - a color sensor for detecting the color of washing water to determine whether or not the clothing fades depending on color change of the washing water during a washing process, - means for issuing an alarm of clothing color fading, - a sampler arranged at a bottom of the outer drum for influent of the washing water and that communicates with the outer drum , wherein the sampler further comprises a housing defining a chamber for receiving a certain amount of washing water at regular time intervals (t) and, wherein - opposite side walls of the sampler are equipped with an LED light and the color sensor , respectively, both a portion of the housing corresponding to the LED light and a portion of the housing corresponding to the color sensor are transparent and made of a light-transmitting plate , the white detection light emitted by the LED light passes through the washing water in the sampler to the color sensor , and the color sensor obtains the color of the washing water based on a received detection light color, and - a processor is provided for comparing, at regular time intervals (t), measured color values (R n , G n , B n ) detected by said color sensor with set reference values, thereby detecting the change rate (ΔR n , ΔG n , ΔB n ) of the color of the washing water based on the received detection light color, characterized in that , a bowl-shaped reflective plate is provided around a periphery of the LED light which reflects a divergent white light emitted from the LED light as a parallel light to the color sensor , a convex lens is provided between the color sensor and the light-transmitting plate on a corresponding side, and the parallel detection light passing through the washing water is focused to the color sensor . - a color sensor for detecting the color of washing water to determine whether or not the clothing fades depending on color change of the washing water during a washing process, - means for issuing an alarm of clothing color fading, - a sampler arranged at a bottom of the outer drum for influent of the washing water and that communicates with the outer drum , wherein the sampler further comprises a housing defining a chamber for receiving a certain amount of washing water at regular time intervals (t) and, wherein - opposite side walls of the sampler are equipped with an LED light and the color sensor , respectively, both a portion of the housing corresponding to the LED light and a portion of the housing corresponding to the color sensor are transparent and made of a light-transmitting plate , the white detection light emitted by the LED light passes through the washing water in the sampler to the color sensor , and the color sensor obtains the color of the washing water based on a received detection light color, and - a processor is provided for comparing, at regular time intervals (t), measured color values (R n , G n , B n ) detected by said color sensor with set reference values, thereby detecting the change rate (ΔR n , ΔG n , ΔB n ) of the color of the washing water based on the received detection light color, characterized in that , a bowl-shaped reflective plate is provided around a periphery of the LED light which reflects a divergent white light emitted from the LED light as a parallel light to the color sensor , a convex lens is provided between the color sensor and the light-transmitting plate on a corresponding side, and the parallel detection light passing through the washing water is focused to the color sensor . <EOS>