The utility model relates to the field of textile machinery, in particular to a fiber friction color fastness instrument, which comprises a main control module, a winding mechanism controlled by the main control module, a reciprocating driving mechanism, a friction head and a winding plate, wherein the winding mechanism is suitable for winding fiber yarns on the winding plate under the control ofthe main control module and spreading the fiber yarns into a plane; the reciprocating driving mechanism is suitable for controlling and driving the friction head to rub the fiber yarn back and forth in the length direction of the fiber yarn through the main control module, so that the color fastness is judged according to the fading degree of the fiber yarn, the situation that dye migrates to theskin of the human body and is decomposed under the catalytic action of sweat stains and saliva is avoided, and the health of the human body is guaranteed.